Greetings,

I have a 1993 Ford F150 XTL 4.9 V8 and I have a weird issue where it feels like the truck will just miss once and then not miss for about 20-30 seconds then miss again. The more I drive the more it seems to miss per minute. If I press on the gas it will stop doing it. If I'm at around 50mph and let off the gas a little bit, then get back on it, it will miss until I get back into the throttle more.

Things I have done:

• Replaced all the vacuum lines. They were damaged and it was losing vacuum. The truck now holds 17" of vacuum while idling.
• Replaced Ignition Coil
• Replaced Distributer
• Read the codes out of the PCM, fixed what it said, and reset it. No additional codes are presenting anymore.
• Tested Throttle Position sensor, it was smoothly rising in voltage and didn't jump around.
• Cleaned the IAC Valve. It was pretty dirty
• Cleaned Throttle Body. It was mostly clean
• Battery grounding to truck body was bad. Cleaned connectors and mount point. Also cleaned positive terminals and ends.
• Engine Ground was dirty too, cleaned it.
• Tested Fuel regulator, when I removed vacuum line fuel pressure rose to 40psi.
• Fuel pressure starts at 35psi and hovers around 30psi while truck is running
• Cleaned EGR valve, validated that under vacuum the valve rises and falls.
• Wires and plugs are less than 5 years old.
• Ran fuel injector cleaner through it

Truck starts easy and doesn't stall out, it just has that miss from time to time. I'm kind of at a loss on what to test or replace next. Any advice or suggestions would be greatly appreciated.