Hello, so I have been chasing this problem in my truck for about 2 weeks now. It started with the injectors not firing one morning. So I changed out the ignition control module along with the pickup coil, rotor, and rotor cap. So put everything back together and it fired up great but now its dies at idle. Basically as soon as it idles down to 700 rpms it shuts off. It seems to drive down the road okay after taking it around the block but it just will not idle with any load on the engine. So far I have tried the following
- different new ignition control module.
- fuel pressure tested at right around 11 psi.
- changed the pickup coil to the old one from before i started having the problem.
- tried the old cap & rotor.
- new iac valve.
- new ac delco plugs.
- new egr and cleaned
- tested the map sensor and it seems good.
- new coil.
- set timing to 0 with est wire disconnected.
- replaced the base gasket on the throttle body because it seemed to have a slight vacuum leak and cleaned up around the iac port.
- test voltage on tps and was right around .7 volts but swapped with a spare i had that showed around .5