98 firebird 3.8

Asked by May 31, 2017 at 07:33 AM about the 1998 Pontiac Firebird Base

Question type: Maintenance & Repair

Playing the sensor game, car was not running well, codes said to replace fuel. automatic idle, and oxygen sensors, I did and it ran a lot better but when it heats up it lobes, surges, and dies ,will not idle. Not sure if another sensor or vacuum leak

3 Answers


Have you done a complete tune-up on it clean the throttle body excetera

Cleaned throttle body replace idle sensor , automatic idle sensor, and mas air sensor, I talked to a mechanic and he said it's possible it is the crankshaft sensor or cam sensor. I'm changing the crankshaft sensor first, let you know what happens.


I would check the ignition module...saw a recent video on 3800 with problems and the motor was running on 1 coil, the circuit board under the coils was bad. Another source of poor performance is the cam sensor.

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