fordman954

Hey guys, this is a shot in the dark, but have any of you had any problems with a slight misfire, not enough to set off the check engine light, but enough to rock the motor? I have done plugs and coil boots and it does not fix it. I sat in my cousins 2003 mach 1 and it purrs like a cat at idle, mine has a slight shake to it. I have tried injector cleaner as well, the car has 69,000 miles and it has been well taken care of. Any body have any suggestions? Thanks!

Bullitt5339

Right around that mileage, I had the same problem. A couple coils were weak, took it to Ford, they load tested the coils, I replaced the ones that tested weak, and it's been purring like a kitten since then.