2000 sunfire 2.2l no power and shakes but runs good in park
my sunfire started shaking and misfiring last week the cat was glowing red so i changed it and also changed the wires and plugs now it runs goodin park but when i took it out the driveway and down the raod i have no power and the car is shifting hard and sounds like it is going to stall but it does not stall could it be something besides motor or trans?