ok. I have no codes from the computer. Plugs, wires, rotot & cap changed 6 months ago. All filters clean, I inspected the plugs today and they all look good and similar in colour. I added a concentrated Amsoil injector cleaner for the last 2.5 tanks of fuel. Performance has not decresed car runs as though nothing has changed. No visable fuel leaks with the car running or sitting. Only strange occurance was recenlty while the car was idiling for about 25 minutes it stalled. Also when the car idiles it sometings jumps from 900rpm to about 1000/1100 rpm before returning to 900.

The only other thing that i can think of is to replace the front O2 sensor, however i am not getting a code and i do not want to replace somethin that is not required. (starving student)

Where are the 150km/tank going????????

I will be in your debt if you can offer insight.