I have a 97 Mustang GT with around 140k miles. At idle it seems to be misfiring (popping if you listen to exhaust). I replace plug wires last december(when i had the same problemwith more popping)and plugs are fine. Do the EDIS towers normally go bad? What else could this be, car runs extremely rich now.

 

Just to let you guys know the wires I installed last December are the Taylor 10mm wires.

 

could be a number of things with that amount of miles.if your ignition is good, then my first thought would be injectors. i would check those, maybe you have one or more dirty?

 

Does anyone know if the stock mustang coil packs last over 140k or do they die quicker?

 

a coil pack is bad

 

^ ^ ^ ^ I agree. Mine has 120k and havent had any problems. It doesnt look like the previous owner has replaced the coil packs on mine. Your plug wires should be fine for under a year old. Have you checked the coil packs for voltage? I know there are a few companies that make aftermarket coil packs for our cars. I remember seeing MSD makes them too. They werent that expensive either.

 

I have one ford coil pack with 160k on it with no misfire. i did have one go at about 120k though. The running rich thing sounds like a MAF or oxygen sensor thing though. Any codes? usually the coil packs going bad throw a code or two.

 

No, the only code i get is rear oxygen sensors gone due to my o/r x pipe.