Reduced power

2008 PONTIAC G6
137,000 MILES • 4 CYL • 2WD • AUTOMATIC
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WYATT HICKS
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  • 1 POST
When I get into my car and start driving my car will shift very rough and it will jerk the car around. After I start getting down the road when I get to about forty five mph, the car will go to really high revs and will not shift until I let go of the gas, and when it shifts slowing push it to accurate. Those are the main problems but the car is also very sluggish and it takes a long time to get up to speed.
Nov 1, 2017 at 9:26 PM
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SATURNTECH9
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  • 30,869 POSTS
Sounds like you could have a plugged catalytic converter.
Nov 2, 2017 at 12:58 AM
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STRAILER
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  • 53,872 POSTS
If the catalytic converter is partially plugged it lowers the vacuum the engine can pull so the computer think it is going up a steep hill hence the late shifts.

Here is a guide to help you determine and confirm the problem:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please let us know what happens so it will help others.

Cheers, Ken
Nov 2, 2017 at 6:35 PM
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