Runs like CRAP- will not stay in overdrive
I have a '93 Bonneville SE and I replaced the plugs and wires and the car still runs rough and the car seems to BOG down between 45MPH and 50MPH. It'* like it won't stay in 4th gear! My gas mileage is also CRAPPY. I thought it may be a clogged Catalytic Converter so I banged on the Cat when it was cold- NO rattle! I checked for trouble codes and there are NO trouble codes- only Code 12 (System Pass)! I also checked the transmission fluid. It'* O.K. Doesn't smell burned and is still RED. Any ideas?