dublenaught,
The question would be what have you overlooked...the answer would be nothing. This means one of the systems you have deemed A-1 isn't! These trucks are almost stone age simple!
If plugs are fouling, and by that I mean they no longer fire...permanently until changed, they are 'shorting out' from some material being deposited on them, or the ignition is SO marginal that it can't overcome a moderate amount of cylinder pressure and fuel.
When the engines misses like hell on acceleration, and you let your foot off the gas, does it return to a smooth idle?
A fouled plug stays fouled until replaced or cleaned and reinstalled. Are your plugs fouling.
A miss on acceleration can be caused by many things. Usually ignition, but sometimes excess fuel that drowns out a plug or plugs. When you back out of it, the problems clears.
Do you change plugs each time to get the truck running properly again.
You mention gas..isn't this fresh new gas or is there more to this tale. Don't give up, it's something right before your nose.
There are no obvious things missing like the wiper vacuum line and the firing order is proper...153624, clockwise, from the front!!
Stuart
