I changed the plugs and the plug wires it ran a little better, but still sluggish in all gears but worse in 5th what could it be
I have a 1997 mustang svt cobra. It is very sluggish especially in 5th gear. on 1997 Ford Mustang Cobra
Assuming that you don't have a brake problem,such as frozen caliper.My next thought is an issue with the cat converter.A clogged or failed one won't let the motor breath properly.