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Have the fuel system pressure tested. Sometimes the check valve in the pressure regulator fails. Testing will ensure which parts aare failing. could be the pump or the regulator.
CODE PO420 CATALYST BELOW NORMAL BANK 1 .POSSIBLE CAUSE CATALTIC CONVERTER , WIRING , HO2S 2 HAVE VECHICLE PUT ON A SCANNER TO CHECK FUEL TRIM.A RICH FUEL MIXTURE WILL CAUSE THIS PROBLEM.MAKE SURE SPARK PLUGS AND WIRES GOOD AND FUEL INJCTORS ARE CLEANED NOT CAUSING ENGINE FLOODING MAKE SURE O2 SENSORS OKAY.IF YOU HAVE TO REPLACE THE CATALYTIC CONVERTER. AND FUEL SYSTEM STILL RICH IT WILL BURN OUT NEW CATALYTIC CONVERTER.YOU WILL BE REPLACING IT AGAIN.
Go to local auto parts store and have them do a code check for you. I know here where I'm at they do it for free, and can tell you right off the computer what the code is and possible things causing the code or codes. Then you can go from there ad maybe fix it yourself, and save a ton of money.Here we have Auto Zone and Advanced Auto, they both do this for free.
Most cases it's a throttle chamber issue. Most likely your service engine soon light is on. You should have the code checked to verify. If I am correct and it's the throttle chamber, it will need to be replaced and the truck will need a idle relearn. This can only be done at the dealer.
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