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My Alero has been missing for about 2 months now. But, it's an irregular miss, happens ever so often. The car will buck, like say it when you're spinning the tires and then they grab traction and it jerks you back, yeah, that kind of jerk just oposite because the car is losing power.
I have replaced the O2 sensor, that didn't help at all. I then replaced the spark plugs, and for about two weeks the bucking stopped, but the engine light stayed on. But then last Thursday, the light went off, and the day after that the car started bucking again.
The bucking occurs most frequently in 4th gear, although it has occurs sightly in 3rd a couple times. It mostly occurs between 55-70, and 75-90ish. Also, the car will sometimes buck so violently that it causes the transmission to downshift.
I am absolutely stumped. Can anyone offer me any advice? Please?
My car is a '99 with the 3400 and 40,000 miles.
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