Question about 2003 Chevrolet Impala

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My 2003 chevy impala isn't shifting properly

I got my manifold replaced because it needed it but when i got it back from the shop it was real gutless specially going uphill the rpms get stuck at 4000 and i have to let off the accelerator so it can shift but even then it has on power it does about 50 mph and will not go anymore. I got my transmission flushed and the filter was replaced. My fuel filter was replaced also now they said it is my catalytic converter could this be the problem or is this a transmission problem?

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Well did the vehicle run normal before you took it in ?.and yes a converter can cause the restriction of proper exhaust flow and may restrict the acceleration but sounds like a setting issue as well

Posted on Sep 08, 2009

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It is possible that it is a cat problem, or o2 sensors. Though your car's engine light should be coming on if that's the case. How reliable are your mechanics? If you didnt have any problems before the car went in. Then most likely they installed or reinstalled something incorrectly. Also how many miles are on the vehicle?
Thanks,
Lee

Posted on Sep 08, 2009

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1 Answer

2003 Chevy Impala when going uphill transmission doesn't shift when giving gas. You have to let off gas for car to shift.


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Thank you for using fixya and good luck

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Did you have it serviced or rebuilt, If you had it rebuilt I would take it back to the trans shop for warranty repairs.
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