When I start my truck up and drive it runs fine,but if I come to a stop in drive with my foot on the brake for about a minute or more it wants to die. I just changed IAC and air filter then took it for a fifteen minute drive and it ran fine, but when I got home I parked and it only idled in park for about 30 seconds then died. This has been happening for about a week. Any ideas? I am going to install Hughes plenum and gasket this week. It should arrive tomorrow. I have changed plugs, wires, cap, rotor, IAC, air filter. Could this be TPS? Thank you for your time.

 

My truck did this for so long and I couldn't figure it out. Till finally one day I had the hood open while it was running I was checking the tranny fluid and I could hear whistling, turns out one of my vacuum lines was torn. I don't know if that's the same problem your having, but I'd take a good look at all your vacuum lines and make sure they are either attached or torn.

Good luck.

 

mine used to do the same thing intermittently until I ran a can of seafoam through it....I think it cleaned my iac or tps somewhat, somehow? and hasnt done it since.... I see that you already changed your IAC though maybe resetting the pcm to relearn and adjust? of course it should do that regardless within like 200 miles of driving I believe...

 

I will check all vacuum lines. Thanks for the idea. And I was wondering did you run the seafoam through the brake booster vacuum into the intake?

 

Check the fuel pressure with a gauge. Start it and run it until it stalls while you watch what the reading is. Should stay around 49lbs.

 

usually when you change the iac you should reset the computer. if you dont reset the computer, it still thinks that there is a bad iac in it. what i do at work when i change an iac is i disconnect the battery for 20 min. while the battery is disconnected, hold the brakes for a min. that will get rid of any memory you left in the computer. then when your done and hook everything back up, i usually drive the highway for 3-5 miles for a relearn. if you dont mind me askin, why did you change the iac in the first place?

 

vacuum leak

 

might be your front o2 sensor as well...

 

Just so you know:

The RAM is kept alive by the battery thus, when removing power, this wipes the memory out completely after a period of time.

TO wipe the memory out without having to wait 20 minutes, simply remove both cables and short them out. It's instantly discharges all stored power in the capacitors and is ready to be reconnected and re-baselined. However, I don't like that method because it's hard on the caps. I prefer to use a resistor to ground to gently discharge the caps. Much safer and no spark as well.

All disconnecting of the neg bat cable is doing is draining the caps in the power supply at the PCM. Holding the brake, turning on the lights, pressing the horn, turning on the flashers on, turning the key to <ON> etc does nothing since the negative cable has been removed and does nothing to drain anything to ground because the CKT can not be completed due to no ground.

CM

 

I replaced it because I took it out to inspect it and maybe clean it and the the plunger fell apart. It just came out when I turned it upside down.