Hey out there .. Got an issue with my 200k 98 cavalier 2.2L it's having issues with seem's to be after about 2-5 minutes of driving the RPM on at stop bounce rough back and forth from 800ish n 900 rpm, if i turn the car off and restart right away it goes away, and will drive normal again too but after a couple minutes again the car is like skipping when i give it a certain amount of gas, gas mileage is bad 300 Km's or so on full tank and was just doing 500 km's tank, now i was over at GM and tech there said the plugs i am using are NGK and not really designed for the motor i have, its the wires n spark plugs i believethat are NGK, Should i Change them ? he inspected them and said they looked ok tho, ne hows Thanks for responces in advance., car has a funny gasoline spell as well, and seems like my RPM stick between shifts a bit n take a second to come down, only when after driving for a couple minutes and issues starts.

Sorry guy's it's Actually P0171