I have a 2000 Chevy Prizm with about 150,000 miles that has been
really good to me so far with one exception. I just replaced both o2
sensors and this one problem seems to have gotten worse. In
mid-drive, or on cold morning starts, the engine likes to sputter and
just about lose all power. Sometimes it sounds like it is cyclical...
while holding the gas pedal even, the engine revs high, then releases,
then repeats. Twice it has stalled out. Over the course of a year
and a half I have replaced the Mass Air Flow Sensor and both O2
sensors now. It actually appears as though it is getting worse after
replacing the O2 sensors. So maybe I’m headed down the wrong track.
The error codes had all pointed that way, but who knows.
I’ve been thinking that it could be the catalytic converter, or
perhaps something to do with the throttle. Thanks in advance for the
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