Originally posted by mcfast:
I had the same thing now for A few months. After a few test I think I found my problem. Test #1, Put in new spark plugs NGK IRIDUMS std gap 54 ran good for 3 weeks after that runing bad agan. Test #2, New spark plug wires, look at the plugs did not look good, gap to 40 ran good but I went ahead put in some new spark plugs MotorCraft AGSF32PPM thay do not make them any more I put in some replacement MotorCraft plug std gap 54, run good for a week after that
runing bad agan. Test #3, So today I completely clean my IMRC and put in some new pulgs, AUTOLITE APP764 gap to 40 so far so good we will see in a couple weeks if she is still runing good I think I have a weak coil.

Well,I drove to Montreal yesterday, to see some friends and a used 2001 Mustang SVT,its about a 400 miles trip in all. Did a few high speed test and the car runs great! Wail I was there I look up a old friend of mine that I once work for, he has a ultralite aircraft egine rebuild service. We where just sitting around shooting the sh!t about aircraft and engines, I was telling him about the problems I been having with my car, that I had to close the gap on my spark pulgs to make it run right. He said thats funny he's been having problems, to with he's aircraft engines, that have a high level of alcool in the gas up to 18%, they vibrate and run bad and to fix the problem he close the gap on the spark plugs, after that they run good. I was just wondering if that could be one of are problems?

SVT 99 #526 of 2760