ok guys have a 1999 mustang 3.8 at just 100.000 mi and it has a miss in engine so replace plugs and wires still there also when you drive it feels like a tire is not balanced at certain speeds . saw a post here a few days ago that the guy had the same prolbem as me found out it was the harmonic balancer hoe do you check to see if that's it it?

 

Are you sure its an engine miss and it would be a good idea to also replace the coil pack if you also replaced the plug and wires. Easy to do its only 4 screws but make sure you replace the wires in the correct order.

 

sorry coil pack has been changed too also though mite be converter but that checks ok.

 

If it was the balancer you would see it wobble all over the place while the engine was idling. Good luck...