Hello all,
I have had this issue for several months now. About 6 months ago my cap and rotor was in such bad shape, the truck died on my way to work. So I replaced both and all was good. About 2 months later it started missing just like it did before it died. I looked the cap and rotor and they didnt look that bad. I cleaned all the contacts and it ran great again for a week or so and the miss returned. I had a lifetime warranty on the parts so I got another set. All was great again for about 2 months and 2k miles then the miss came back again to where we are today. Here is a current pic of the 2nd set before I cleaned them again. If you look in the cap you can see some dust around the perimeter of it. The rotor has a spot on the corner of the electrode. I have since cleaned all the contacts on the cap and rotor.
So what is causing this to happen? I have 255k miles on the truck.
Thanks for your input.
Steve