At first it start and then shut off, start and then shut off ,then it would crank up and run but would not rev over 2000 RPM in gear or out of gear, sometime it will crank up and run for 30 minutes and then just shut off crank right back up running 5 or 10 minutes and shut off. now it seems like it'll crank up when it's cold and run just fine, as soon as it warms up it won't rev 2000 RPM. someone said it might be corrosion in the control module I have unplug everything cannot find corrosion anywhere, after plugging and unplugging everything in the truck it ran just fine for a mile or two down the road then went right back to doing the same thing. I just bought the truck and really don't know anything about its history .it has 266,000 miles on it, replace spark plugs ,wires ,rotor and cap .I just put a coil and igniter on it (used) but haven't had a chance to try it out yet. checked for vacuum leaks everything is good .can anyone possibly point me in the right direction

 

vapor lock? or a clogged fuel filter?

 

I don't think it's a vapor lock has brand new fuel pump brand new fuel filter brand new fuel injectors new air filter

 

Have you checked iac valve might be part of problem clogged cat would be something else i would check or exhaust for a blockage. Just a guess lol

 

The iac valve appears to be working and the cat does not seem to be plugged, the IAC valve is doing what it's supposed to with engine under load and plenty of exhaust comes out the tailpipe

 

Gotta be a loose connection wore out pin maybe in a connector

 

Connecting pins what I'm thinking as well going to check on my grounds for any dirty connection

 

Ok, opened ECM found corrosion on a transistor other corrosion on a diode cleaned it and now it runs fine. Note: if you open the ECM. DO NOT TOUCH any CHIPS static electricity from your finger can blow a chip!!!