In drive it it did not want to go over 35 mph

2001 PONTIAC FIREBIRD
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APRIL07
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At first and then it got up to 50 mph. what could be the problem? i drive an 01 firebird. when i start my car the car/engine shake and makes a rattling noise. when i tried to drive it it did not want to go over 35mph at first and then it got up to 50mph
Jan 31, 2012 at 6:22 PM
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RASMATAZ
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Have the exhaust system checked for restriction and engine mounts/heat shield

go here for more info

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
Jan 31, 2012 at 6:25 PM