when i press all the gas it dosent go like if someone was pulling it back?
I press all the gas all the way down and it starts to miss fire or something I got the cat and took eaverything out and cleand the injectors and cleand the throdlebody and still does the same what can it be?
There should be some codes showing up if you get it checked. Without that I'd suspect problems with the main ECU but you need to do some diagnostics before you replace any more parts.
I alredy did no codes
Search Pontiac Grand Prix Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Grand Prix Experts