Problems are always bigger if they are yours. Back in the day I had a friend with a GTO and when the spark plugs would get carbon fouled . That car would misfire at the higher rev level the worse the fouling the lower that misfire would occur at. Changed spark plugs problem gone.
The FE engine has the
oil pump driven off the distributor drive. It has a 1/8x3/4 roll pin holding cam drive gear to the shaft . If the
oil pump drag is too great that pin has sheared on my engine. My shear was complete. every thing stopped immediately ,engine coasted to stop no problem. about an hour to R&R the distributor reinstall with new pin and retime. I had been warned about revving engine before
oil was warm I also spent most of a summer trying to figure what happened only to find the car was out of gas and fuel quantity gage was stuck on full, it was empty.
This last summer the 4way flasher switch burnt out, while replacing I managed to flip a toggle switch that went to the staging rev limiter. I thought about it all evening loosing sleep thinking about what was wrong. It came to me but had to wait till day light to check' She wouldn't like for me to start in garage and wake her up.
I have carburetors, you can see if there is gas coming out of carbs just by moving the linkage. Your fuel injection ,I don't know. Several years ago I redid my engine and changed a lot of the wiring and fuel system I installed a Malory Hy Fire VI I had it in the box for months With everything in and on I was breaking the engine out in the alley Had a big fan and all. Later we took the car out and shortly it started running crappy. The further we went the worse it got. I turned around and headed home. It would idle but couldn't hardly get it to leave after a stop. I end4ed up using the shorting plug that comes with the Mallory ignition box, It eliminates the box so just coil and distributor are being used It ran great so the box went back and another box was ordered.. You can work it out. is it fuel or ignition? Check the ignition timing easy with timing light. Does it backfire? If that is Ok then move to the fuel injection group.. Fuel supply pressure?