Okay so I filled the truck up yesterday at Speedway went to start it and it wouldn't idle. If i stayed in the gas it would run, but as soon as I got out of the gas it would die. Last time I had this problem the Drivers side exhaust pipe that goes into the cat had come loose and fell out of the cat. This isn't the problem this time. I could keep it running if i just so lightly stayed on the gas. So i figured it was bad gas, went to the local Autozone and picked up a red bottle of IsoHeat with injector cleaner in it. Put the whole bottle in.Ran fine the rest of the night, and this morning it ran fine. Just went to run to the store and I'm having the same problem. It doesn't sound like it is missing at all. Got it to the store and it would idle but not after falling down to about 300 RPM and almost dieing and then coming back to life. Once it surged it's way back it would idle. Any Ideas?

 

Sounds like your Idle Air Control valve (IAC) is dying or has died. It's an easy fix, held onto the firewall side of your throttle body by two torx screws (T-25 I think). Procedure = unplug old one, take out screws, pull out old one, put in new one, put in screws, attach wire. Then disconnect your battery for a while, connect it up, turn on the ignition and let it sit for 10-15 seconds, then start it. It might idle crazy for a few seconds while the computer figures out the new IAC, but then you'll be golden again.

Have fun.

 

I've had this problem several times with my vehicles and all it took to fix it was to clean the throttle body. A can of throttle body cleaner only cost a couple bucks and I would try that first before buying a new IAC sensor ($40-$50). Just follow the directions on the can. The only engine part you have to remove is the air filter. And if that doesn't fix the problem it was inexpensive and your throttle body is clean.

 

I agree that cleaning the TB is a good idea, but if you want to do it right, take it off and clean out every nook and cranny, particularly the bore for the IAC. It's simple to take off-- just take out the 4 bolts that hold it on and then the 3-4 bolts that hold on the cable bracket. Make sure you have a new gasket handy.

 

humm,,,, You might check your EGR valve, it helps to stabilize the idle. It's in the back of the engine close to the distributor. The reason I say this is, you said you had a problem with you Cat converter, if it is clogging up and not relesing the gases, back pressure might pop the vaccum switch part of the egr off. 2 vaccum lines and an elec conection, mounted on the manifold..