Hoping someone can help me with the issues I’m experiencing with my s15 Jimmy I purchased last month.
When I bought it there was a little bit of a rough idle since then I’ve changed all the vac lines, the coolant hoses, water pump, temp sensor, thermostat, MAP sensor, ICV, spark plugs and wires.
Engine would always stall out when heater turned on until after ICV change.
Old temp sensor always maxed the gauge out now new one shows nothing on gauge.
I also top sprayed the throttle body, all these things seem to have helped a little but not fixed the following list of symptoms:
-Intermittent rougher idle, sounds great most of time then randomly cuts out.
-cutting out while accelerating
-stalling completely occasionally mostly at a stop
-stalling completely occasionally shifting out of park

Any direction or idea what I can do would be greatly appreciated.

I have distributor cap and rotor on the way as well as a new alternator as the voltage at battery is only 13.5 running with a brand new duralast gold.

 

I don't know if it's your problem or not but I had a rough running issue and after I changed everything else out, I replaced the ignition control module, which is attached to the distributor and it solved my problem.

 

didn’t fix my problem.

I checked blink codes and got 14 AND 15.

i think that’s causing all of this.

 

I actually have a considerable 1991 GMC Jimmy with a five.7 litre (350 cid) V8, that has recently evolved a low idle and searching / bouncing idle trouble. When the engine is cold and is started out, it runs fine, with the bloodless idle around 1,one hundred RPM. As the engine warms up (I commonly allow the engine heat as much as approximately one hundred ranges before riding), the idle drops down to about 800 RPM. While using, as the engine continues to warm as much as operating temperature, the idle keeps to drop to in which it finally reaches it’s everyday strolling 650 RPM, because it has completed for the ultimate 14 years I’ve been riding the truck.



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