I brought my 2003 nissan 350z in for an engine light and a rattling cadalytic converter. When I got the car back it wouldn't accelerate like it did before, like something is constricting the air flow. I took it back and didn't bother to check the o2 sensor or the converter they replaced, and insisted it was the electronic trottle body and are now out another $280 . The problem is still there and can't express how angry I am about it I feel like taking the dealer to small claims court if they don't get it resolved without more money out of my pocket

 

why 2 threads?

 

Because he's angry and wants help.

Sounds like the tech working on your car sucks. There is nothing any of us can do from here without more info. Codes scanned, log of whats going on etc.