mjr1001@pitt.edu wrote:
> I have a 91 civic dx. The past few months the car will either stall, or
> jerk then lose almost all power. The check engine light comes on when
> this happens. It happens only occasionally, but during all types of
> driving ( highway, 35 mph, or even just staarting up). If i turn the
> car off and turn it back on, it resets and the car is fine for awhile.
> The other symptoms are the mileage went down from ~35mpg or better
> every tank, to 27-28mpg on the last three tanks. The other thing is
> when i got an emmisions test my mechanic said it didnt pass the HC at
> first (234 reading w/ 220 limit). He let it warm up for half an hour,
> then did it again and it passed.
>
> Any suggestions would be helpful. Could it just be the o2 sensor or
> something else simple?

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You've probably changed your timing belt at least twice by now, based on
age (we don't know your mileage), but have you adjusted your valves? Do
you have stinky exhaust once it warms up? Do your records show a new PCV
along the way?