My 94 grand am had the same problem I had to change my EGR valve which is expensive. I also need to check my knock sensor. I would say start with those. If your service engine light is coming on find a place that does free diagnostics and take it there to see codes.
13.5 to 15.5 volts with the engine idling.
It can, but you should trust the computer diagnostics in a situation like that.
Cooling fan may not be working as it should. If it is not coming on either the fan is defective, fuse is blown, or the thermal sensor is bad. If it is running and the engine is still overheating the radiator may be partially clogged.
There are various reasons why your car would almost stall when idling. In most cases, this might be an indication of the engine lacking power or capacity due to the failure of the pistons. You should contact a mechanic to diagnose the problem.
Check voltage between pins 1 and 4 with the key on and engine not running. You should have 4 to 5 volts. With then engine idling, it should drop to 1.5 to 2.1 volts. Test PCM terminal 36 for same results. If different, check wiring/connectors. Test for MAP sensor ground at terminal 1 and PCM terminal 43 Test supply voltage at sensor terminals 3 and 1. It should be 4.5 to 5.5 volts and the same at PCM terminal 61 If all test good, MAP sensor is bad, if not, fix wiring harness.
If it doesn't have the daylight sensor on the dash, you should be able to turn the DRLs off by applying the emergency brakes.
A low oil pressure reading when idling for a 1986 Fiero is normal. As long as the oil pressure goes back to normal when the car is being driven, there should be no problem. If it is not, then the oil pressure sensor or the oil sending unit should be looked at.
If it is in the center of the dash near the windshield it should be a headlight sensor for day time running lights
It is important to maintain all car parts for smooth riding. A bad O2 sensor can cause rough idling, bad acceleration, poor fuel efficiency, and a warning light should appear on the dash,.
A bad throttle sensor can cause engine jerking and rough running. A test of the computer codes should show if there seems to be a problem with the sensor.
As long as your car engine is running, it should be OK. An exhausted battery will only become a problem when you try to start the car.
no no no my crank sensor when out on my truck ar 95k now i have 125k and she is still running good