I dont know what type of spark plugs are used, its too late to do any work now but i will look tomorrow at the plugs more carefully and actually take the distributor off tomorrow to look at it. Thanks for all your help thus-far though.

 

low idle stumble/stalling is very often a simple bad battery, do you have any idea how old the battery is? this is a very common symptom of a bad battery being that it will crank fine, and run fine w/ a foot on the gas, but once you let up the battery doesnt have enough voltage to keep her running, the pcm goes WTF!?!?!?!?!?!?!!!!!!!!!!! and shuts off the engine.

 

Well their are two 12 inch subs in it running at 900 watts and im not sure how old the battery is. But my battery gauge always stays in the center and even if i play my music at night, the lights dont even dim.

 

battery life on these rigs is about 4 years, probably less in your case

 

Well i put a new IAC in and it seems to be okay now. Drove it for about 20 to 25 minutes and no stalling, stumble, or anything like that. If i have the battery tested by like Auto Zone or another parts store, they should be able to tell me if its good or not right?

 

thats a good place to start, however the load tests are not 100%, especially for these trucks and the picky pcm, if is very possible that the IAC was your only problem, however i didnt include that bc someone else already had.

 

Well I've been driving around for awhile now and its still good, the motor runs a little better now too. So i guess just a bad IAC. Thanks for all your help though.

 

glad you fixed it

 

You should pull the throttle body and give it a good clean job and reset the PCM. You should also pick up a new battery.