Hello All!

So I've been having an issue for several months now with my 1989 Chevrolet Caprice Classic. The issue is with erratic idling accompanied by a check engine light.

For example: After fully warmed up there are times where I will come to a stop and the car bogs down and stalls. Or sitting in a drive through and the idle will surge up and down and the check engine light will come on. The light even comes on while on the highway.

I ran the codes for the light and they are 21, 22, and 24.

First 2 are related to the Throttle Position Sensor and 24 is the Vehicle Speed Sensor.

I recently had a brand new throttle body installed and all sensors located on the throttle body were replaced . This was to remedy the above issue but it is still occurring.

I also recently replaced plugs, wires and cap and just had the Speedometer gears replaced in the transmission due to a non-functional speedometer gauge.

The issue occurs whether AC is on or not.

Any ideas would be great!

Thanks!

 

I have the same exact car and is currently experiencing the same exact thing. What did you do to resolve this problem