There has to be an open circuit between where you plug in and the PCM. Check wiring harness at PCM for corrosion,something loose, pushed in pins. Also, check IAC for idle issues.

Answered by Jacobandnickolas (expert)
57,318 answers provided

hello i checked all my connections to the pcm and everything is fine no corrosion no pushed in pins and all the connectons were tight is there anything else that would make it read there is no power going to the pcm

Response from mglabas
1 question asked

Where are you getting this information?
What is the code number/s you are seeing?
Your truck doesn't have a carb.

Answered by Wrenchtech (expert)
14,749 answers provided

12 is the code #

Response from mglabas
1 question asked

There is no code 12. You always get that code before it reads the real codes stored.

Answered by Wrenchtech (expert)
14,749 answers provided

it will run idling but when i put it in gear it idles down and shuts off it is a manual trans

Response from mglabas
1 question asked

First pull the EGR off and make sure it's not stuck open. At this point you could have issues with the throttle body, IAC, or many other things, especially since you have taken it apart now. You're not going to find this problem with a paper clip. That OBD1 system tracks only a fraction of what the newer computers track.

Answered by Wrenchtech (expert)
14,749 answers provided

when i took the throttle body off and cleaned everything i got new gaskets put it all back together and it ran better but i descovered the problem was the cold start censor and i replaced it then it wouldn't run right again i adjusted the timing and still the same problem the egr isn't stuck open any more suggestions

Response from mglabas
1 question asked

do you think it could be the coil or the distributer cap

Response from mglabas
1 question asked

There is no such thing as a "cold start sensor" so I don't know what you changed. It's probably time for a professional diagnosis.

Answered by Wrenchtech (expert)
14,749 answers provided