BAD RUNNER car runs great but after you drive it come back later it turns over rough but starts and service engine light comes on but no codes come up it acts like its getting way to much gas when hot. we replaced o2 sensorcoolant temp sensor throttle position sensor intake air sensor wires and more injectors test good what next this is 1993 pontiac grand prix 3.1 HELP

i would take it back to where you had it fixed as they diagonised it incorrectly

This is usually caused by a bad crankshaft postion sensor.

loose/weak grounding cable tied somewhere to the frame/starter/engine

This could be the O2 sensor or the MAF sensor. Try disconnecting the MAF sensor and if the idling seems normal, the MAF sensor is bad. Yet, it is always better to get the codes read if the CEL in blinking.

need to find out what codes are causing the engine light to come on and then start diagnosis from there

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Car runs rough and dies.The issue indicates fuel pressure problem.But as you mentioned check engine light comes ON.The check engine light comes ON when the cars computer (the ECU) notices any kind of electrical problem in car. Once the problem gets confirmed the engine light will remain permanently ON till the problem gets solved. In this case I suggest you to get your car scanned at autozone service center. It's absolutely free. In case in car scanning, if any error code is retrieved then you can check which part is faulty as per the error code. At autozone they also deal in parts.So if any part checked out faulty then you can get that part replaced as per the code.-------------thanks.Helpmech.

the only way to know what is causing it is to have the computer scanned to see what code is causing the light to come on. Even if the light goes out the code should still be stored in the computers memory. Once you know the code post it and I can help you further.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Older post...but, just in case you haven't found anything this is a great article.
http://www.off-road.com/toyota/tech/codes/index.html

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.