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Rough engine, No power question

 
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dfshorn1
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PostPosted: Sun Jul 24, 2011 1:11 pm    Post subject:  Rough engine, No power question Reply with quote

I have a 2002 Impala with 3.8 liter engine. 135k mile. This car has run likea dream until last week. I have difficulty accelerating over 20-25mph. The engine will start to sputter and rpm's will bounce up an down. Yet idle and low power acceleraions to 20-25mph are fine.
I have changed the fuel filter and regulator, the tps and air mass sensors. The fuel pump pressure is right at 50psi, ignition on, engine off. I was hoping for some other suggestions other than a clogged cat.

Any suggetions?

Daniel
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tiltrotor22
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2008 Chevrolet Impala


PostPosted: Sun Jul 24, 2011 1:24 pm    Post subject:  Hmm Reply with quote

O2 sensor maybe!
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