Engine Mechanical problem
1999 Pontiac Sunfire 4 cyl Two Wheel Drive Automatic 300000 miles
1999 Pontiac Sunfire 2.2L
When driving, the car intermitently jumps 200-300 rpm.
It occurs at various speeds - but more so on the highway.
Driving 50-60km/h it occurred, as well as at 90km/h
It's been occurring for a number of months but gradually becoming more frequent especially at around 100-120km/h. The car feels like it is lurching or skipping a beat, the rpm spike from 2500rpm to 2800rpm for approximately 3-4 seconds and settle back to normal.
Engine temperature seems good.
Since noticing the issue I have replaced Coil packs, spark plugs, wires, air filter, and the fuel filter.
A mechanic visually inspected the exhaust and the only note was the bracket was broken near the catalytic converter which he tied up with some mechanics wire.
The only things I can think of next are:
1. Air Temperature sensor
3. Maybe fuel filter?
I don't think it's the transmission because it occurs at different speeds.
have the same problem?
Monday, March 29th, 2010 AT 5:25 PM