I have a 1996 Camaro with a 3.8 V6 and AT. This engine is a new crate with 30K on it. I have only had the car for about a month but it has started stalling with no warning while driving on the hwy or at 35 mph. Sometimes it starts right up but on several occurances it has taken 5-15 minutes. Thought it might be the fuel filter. It does have a few codes. P1406 and P1441

SOURCE: car stalling while accelerating

it sounds like you need to inspect your spark plug wires and spark plugs. if they are ok it could be your coil

SOURCE: 98 camaro 3800series v6 engine will turn over but

CLEAN FUEL INJECTORS.THEY COULD BE DIRTY AND CLOGGED UP.FILL GAS TANK UP.PUT A BOTTLE OF FUEL INJECTION CLEANER IN FUEL TANK.DRIVE CAR AROUND ENOUGH TO ALLOW CLEANER TO CLEAN OUT FUEL INJECTORS.

SOURCE: 98 Camaro 3.8 V6 stalls when started w/cold engine

Sounds like your throttle body and throttle plate are full of carbon.You also have a idle air control motor with a pintle on the end that gets carbon on them.Go to your local parts store and get a can of throttle body cleaner and a old tooth brush and clean throttle body and plate and if you can remove the IAC and clean the pintle and bore. that should take care of your stalling.

SOURCE: 1995 3.4 V6 camaro won't start

If your Ignition switch is hard to turn ...... Believe it or not, check the transmission assembly for debris... I had a small piece of wire caught up and when I threw the shifter to 'PARK' it wasn't going far enough to release the ignition key!

SOURCE: diagnostic code p1441 and p1406

Here's the description for the DTC P1406: The PCM monitors the EGR valve pintle position input to ensure that the valve responds properly to commands from the PCM and to detect a malfunction if the pintle position sensor and control circuits are open or shorted. If the PCM detects a pintle position signal voltage outside the normal range of the pintle position sensor, or a signal voltage that is not within a tolerance considered acceptable for proper EGR system operation, the PCM will set DTC P1406.

That means there is possibly a problem within the EGR valve itself, or a wiring/connector related to the EGR valve. Having a scan tool to command the EGR valve and watch the data would be extremely helpful in diagnosing this code.

Here's the description for DTC P1441:
The EVAP vacuum switch is a normally closed switch positioned in the purge line between the canister and the EVAP purge valve. The EVAP vacuum switch will open when vacuum increases to greater than 5 inches of water (in H2O) in the purge line. The PCM monitors the EVAP vacuum switch signal to determine if the evaporative emission control system is working properly. If the switch is open (purge flow detected) when the PCM is not commanding the EVAP purge valve ON, DTC P1441 will be set.

Again, this code would be best diagnosed with a scan tool that can command the purge valve and allow you to watch the data related to it. Check your vacuum lines and electrical connections to the purge vacuum switch. If the vacuum switch is unplugged this code can set.