Need to find a vacuum hose/evap hose for 4.8 1500 chevy

Codes or no Evap Codes, the issue is in that system
You need a schematic of the evap system, so you can
test the solenoid or valves,mainly the vent solenoid, if that
applies Not the purge valve, that is up front & opens to allow
engine vacuum to draw out fuel fumes from the tank.

2001 does not utilize vacuum to engage the front axel. A cable is used. There are a few conditions that can cause this. The most likely is the encoder motor. It's best to have the vehicle scanned. The TCCM is located behind the right kick panel, sometimes if it's unplugged and plugged back in, it will begin to work again.

Change the 02 sensors and check for vacuum leak hoses evap , then disconnect battery and test again .

Check the evap hoses are seated correctly,also check for any small vacuum hoses that may have been knocked off as i have encountered the exact same problem before and it turned out to be a vacuum leak

Check the vacuum hoses not even a pin hole,Follow vacuum hose from throttle body to the evap purge solenoid diconnect line at eps can side and hook a hand vacuum pump to eps turn on key don't start add ten inches vacuum no drop in vacuum replace evap purge solenoid if it works it's probally the nvld assembly

CODE PO442 - EVAP SYSTEM SMALL LEAK DETECTED CONDITIONS, CODE PO455 - EVAP SYSTEM LARGE LEAK DETECTED CONDITIONS, CHECK GAS CAP MAKE SURE ITS IN PLACE NOT LOOSE OR MISSING, FUEL TANK FUEL FIILER NECK OR FUEL SENDING UNIT O - RING IS LEAKING, FUEL TANK PRESSURE SENSOR IS DAMAGED DISCONNECTED OR FAILED, FUEL TANK VAPOR LINES CLOGGED DAMAGED, PURGE VAPOR LINE IS CLOGGED , DAMAGED, PURGE SOLENOID IS NOT OPENING MAY BE DAMAGED OR STICKING, VENT SOLENOID IS NOT CLOSING MAY BE DAMAGED OR STICKING, THE PCM HAS FAILED.

ENGINE VACUUM HOSES ON INTAKE MANIFOLD ARE LOCATED ON MAP SENSOR, PCV VALVE,POWER BRAKE BOOSTER VACUUM HOSE, YOU HAVE VACUUM HOSE TO FUEL PRESSURE REGULATOR.YOU HAVE VACUUM HOSE TO EVAP CANISTER PURGE SOLENOID.

P1443 - EVAP Control System / Vacuum System Purge Control Solenoid Or Purge Control Valve Fault. A fuel tank pressure change greater than minus (-) 7 inches of water in 30 seconds occurred with a purge (fuel vapor) flow at less than 0.02 pounds per minute.

Possible Causes:

Blocked fuel vapor hose between the EVAP canister purge valve and the FTP sensor.

Blocked fuel vapor hose between the EVAP canister purge valve and the engine intake manifold.

Blocked vacuum hose between the EVAP canister purge valve solenoid and the engine intake manifold.

EVAP canister purge valve stuck closed (mechanically).

Possible Solution:
Check for blockages between the fuel tank, the EVAP canister purge valve, and the engine intake manifold. Check for obstructions in the EVAP canister purge valve diaphragm and ports.

The canister is on the passengers side near the firewall if I recall correctly.

P1457 is the EVAP canister system, including the popular vent-shut valve underneath the left-rear seat. Check out this thread, I put something towards the bottom.

P1457 won't make the car run bad at all. It just means the EVAP canister & the related system of hoses & valves isn't airtight.

Check this stuff in this order. As soon as you find something that doesn't behave like it should, fix or replace it. Then hope it was the only thing wrong with the system...

Some background for the electrical troubleshooting:
All the solenoid valves have constant +12v supply from the main relay. When the ECM wants to energize a valve, it closes the ground side of it's circuit. If the +12v supply is broken, then the ECM can't energize the valve. If the wire to the ECM is shorted to ground, then the valve is energized even when the ECM doesn't want it to be.

EVAP Purge Control valve - between intake manifold & valve cover.
Valve should be normally closed, so it will hold vacuum when it's not energized. Ground is supplied by pin A6 of the ECM to open the valve. So jumper pin A6 to ground, turn on the ignition, and check again - this time it should NOT hold vacuum.

EVAP 2-way valve - underneath the car roughly under the left-rear seat.
It's a little can with 3 hose barbs & a solenoid valve attached to it. Leave the connection on top, disconnect both on the side, attach MityVac to lower one. Normally open, when the solenoid valve is energized, it should hold vacuum.

EVAP Vent Shut valve - attached to the charcoal canister underneath the car.
Normaly open - when ECM closes pin A4 to ground, it should hold vacuum.

EVAP Charcoal Canister - the big can under the car, about under the left-rear seat.
Leak test: Connect all the hoses together, plug the Vent Shut valve, connect the MityVac. Pump vacuum while watching the fuel tank pressure (FTP) sensor. You can read FTP sensor voltage with a scan tool, or use a voltmeter between pins A29 & C18 at the ECM. Pump down to 1.5v & it should hold that vacuum for at least 20 seconds.

EVAP 2-way valve vacuum & pressure test.
If you get this far you'll want the manual for a good picture of how to connect the hoses. Keep pumping the vacuum pump & it should stabilize between 6 & 16 mm Hg of vacuum. Then pump pressure, it should stabilize at 8 mm Hg or more of pressure.

Then there's a test of the ORVR Vent Shut valve, which is located on top of the gas tank. You check vacuum & pressure at a couple hoses alongside the fuel filler pipe. If the valve is bad you drop the gas tank to replace it...

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Replace the gas cap,(tight don't mean it seals)
check evap hoses coming from the gas tank and the hoses on the evap canister