Grand Prix 2002

My car has been acting up it started to shake a bit and it wont excellarate past 20 mph.. I changed the oil because I thought maybe thats what could of been causing it but it still the same..Its a 2002 Pontiac grand prix, any idea what could be causing this?

:banghead:

what model of GP do you have, and how many miles are on it?

Check engine light on?

Sounds like it could be a clogged cat converter.

GM has extended the 2002 model year GP Cat Converter warrenty to 120,000 Miles (I believe).

How many miles are on it?

my converter went bad around 50,000 miles. Didn't know about the GM converter warranty. Install a high flow aftermarket converter. GM paid for 85% of it after I connected with them. 75,000 miles now and still runs flawlessly.

Is this an engine shake or vibration? Bad tire, rim?