Thought you guys could help me out with something concerning the following truck
98 4.2L, manual tranny, 3.08 rear.
The truck has started to hesitate and buck under load.
Actually, it hasn't just started, it has started it again. About a month ago I remedied the bucking situation by replacing the plugs and the wires. I found a wire that has arcing out under load. Up until about a week ago the truck has ran fine. But it has now started acting up again. Let me run down with you guys what has been done to the truck recently...
new fuel filter
new air filter
recent oil change (has been done every 3k since the truck was new)
ran a couple cans of FI cleaner through, hoping the problem was dirty injectors or maybe water in the fuel.
Other than this annoying problem, the truck has been flawless. It has almost 70k on it, cranks off about 20 MPG consistently and has never let us down.
Any ideas? I was thinking maybe the coil pack, but I don't know if the 3.8L/4.2L ford engines have had this problem.
Now this problem only happens under load, that is either lugging the engine in too high of a gear, heavy acceleration, acceleration during passing (the most annoying) or at night with the A/C and lights on.
Any more ideas to try? I am beginning to get frustrated. The bucking feels exactly like a miss, which is what I think it is. For it to go away with new plugs and wires, and such an obvious arcing problem with the wires, to have it come back again is just plain frustrating!
Thanks for any advice you can give me..