2001 Ford F150 Has a jerk to it while driving

THis is a tough one without the check engine light. Because the miss is so temporary, the computer doesn't pick up on it. Has the engine been tuned up reciently? Is it the 5.4L or the 4.6L?

Let me know so I can make some suggestions.

Thanks,

Joe

It is the 4.6L, and it doesnt do it all of the time making it tough. I replaced the spark plugs last week to see if that would help, but that is it as far as a tune-up goes.

Does each cylender have its own coil pack? If not, have you checked the wires? If it does, I have seen the rubber boot that covers the plug actually arc through to the valve cover causing an occational miss. Also, since it only happens at higher speeds, I wonder if the fuel pump may be getting weak and not keeping up. Was the fuel filter replaced reciently?

Let me know.

Joe

It does have a coil pack for each cylinder. The fuel filter was recently replaced. It seems like maybe its when its shifting at that 45 - 50 mph range. So i dont think its the fuel pump.

Please realize that without a check engine light, everything becomes a guessing game. From experience, I have found the rubber boots on the coil packs (that go in the plugs) break down and allow the coil to short through them. It is hard to find because the only evidence is a small light gray spot on the boot itself. The interesting thing is it is more prominent when there is a load on the engine. When you shift at a higher speed, the load changes and demands more from the engine.

At this point, that is a theory, but it's something you could check.

Let me know.
Joe