[olddog]

Distributor cap looks like new and is dry.

The only code is the left O2 sensor not switching. I had this code a couple weeks ago and replaced both O2 sensors. I never cleared the codes, and I have only ran it a few times since replacing them. The new O2 were Bosh for a 5.0. They were not exactly like what came out, but no one could match the part number up. Since it is a Ford EEC-4, I figured they should be OK.

I drove it to a car show yesterday and it ran fine. It only seems to do this if you get it hot and then shut it off for about a half hour. Which is when the under hood temps would be the worst. Then when you start it, it misses under load. With the hood open and vacuum line off the fuel pressure regulator, I pulled the throttle and gunned it hard to make it missfire. When it missed the fuel pressure held steady at 45 psi. Form this I do not think it is a fuel pressure drop issue.

I think my next move is to try to get it hot and make it go into a miss again. Then I'll check the coil with an ohm meter. I'm also going to try to borrow a coil and swap it while it is hot and missing. I wonder if my 98 Ford Ranger (Mazda) coil would work?