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.
DAY 1 SO FAR SO GOOD! STILL RUNING STRONG!
Did your engine knock at all? I think one of my cylinders is predetonating. Someone suggested closing the gap on the plugs but I havn't tried it yet.
NO! Put closing the gap on the plugs sure made it run better. I would try it on yours.
