20 Most Recent 1987 GMC S-15 Pickup - Page 2 Questions & Answers

You replaced the starter and solenoid. Did you check to see if you have battery power at the large starter post, and on the small wire coming from the key switch ?

Is it fuel injected? Mine is throttle body injected and found the injectors were dirty. If you haven't done so yet try running some fuel injection cleaner through it. Might have to do 2 tankfuls of fuel and cleaner. Also first check the fuel filter passenger side rear. Fuel filter is cheap and usually solves alot of problems

Sorry but a ride with a tech is required here.

your egr valve is stayn open or the gasket where its attached to exhaust is worn--take it off to testit or replace cause of age of car

F150 is a Ford model truck, not GMC.
But at any rate, since I don't know if you have a Ford F150 of some kind, a 87 GMC S15 or some kind of 89 GMC with a V6 I will suggest taking the ignition module to an Auto Zone and having them test it (A free service). Also test the fuel pressure.
If a tune up and fuel filter has not been done in some time that could very well be an issue.

You can get any type scan tool or code reader you
want, at any price range on the internet

You have an OBD1 Vehicle (1981 thru 1995),
so you need one for that

You know any repair shop has a scanner

If you live in the world of free your in trouble.