Re: 1990 Grand Am, performance problem -- exhaust, MAS?

you could have a back oxyger sensor and or a tPS throttle position sensor !!
does you service engine light come on or andyother indecator light???   mail
me back
Bill
~~~~~~~~~~~~~~
1989 Chevy S10 Blazer
4.3L
22700.00 Miles and runs great !
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<[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hello everyone,
> I have a 1990 Grand Am (tech 4 2.5L), it runs, but doesn't accellerate
right
> any more, and the gas milage is getting bad.  It seems like an exhaust
> problem, and I'm suspecting the catalytic converter, or the MAS (Mass
> Airflow Sensor).  I tried taking the catalytic converter off to see how it
> would run without it (isolate the problem before I shell out $70), but the
> bolts are rusted on.  The exhaust pipe does change the airflow while the
car
> is just sitting there, and there's black stuff in the tailpipe.  My car
> doesn't burn oil, just had the sparkplugs, airfilter changed, and the oil
> was changed last month too, but it's black again.
>
> The performance actually goes up and down, sometimes while I'm driving, it
> will run well, sometimes it's in the gutter.  I've also noticed a little
bit
> of clicking, when I rev the engine in neutral, and it almost stalls if I
rev
> it up in neutral, and then take my foot off.
>
> I'd really like some ideas from people, even not particularly relating to
> this car.
>
> Thanks,
> Carl Busjahn
> busjahn(nospam)@bellsouth.net
>
>