I have a 98 Saturn SC2 16V DOHC. The car has started to rough idle at stop lights and now is dying at some longer lights. I have replaced the plugs (this stops the problem for a short while) the valve cover seal (stopped oil leak into plug housing), Engine coolant temp sensor, Idle Air Motor, Cleaned throttle body, cleaned the fuel filter, and run seafoam. This problem has me on the ropes. I'm thinking vacuum leak possibly. However the car runs beautiful with the AC Unit off but runs hot due to the fan not running. If you turn the air on at all it starts to run terrible. No acceleration, stalls, shakes while driving. Any ideas would be helpful. Feels like the engine misses when the AC is engaged.
Sep 13, 2013 at 11:31 AM