CEL and surge issue.
Here are the specifics -
94 SE - 200K miles.
While driving, there is a surge under light throttle right at 1800 rpms. I can put it in drive, hold the brake (while stopped) and feather the throttle to about 1800 rpms (light load) and also get the surge.
Moderate to heavier throttle up to highway speed, no problems.
A few times it will die after letting off the gas when approaching a stop sign. It always restarts easily. Always idles fine.
CEL comes on and goes off after a surge. Sometimes it stays on until you restart the car, then it is off.
Carb cleaner through the throttle body. No change.
Codes? Here is the problem. I have tried two different readers (one at Advance and one at Autozone) and both say they can not communicate. Would this car be OBDI or OBDII?
I talked to a mechanic buddy of mine and he suggested the throttle position switch.