i have a 92 f150 5.0 with a little over 116000 miles on it and it usually does it at 30-40 mph it kinda studders or misses, its kinda jerky but not real noticable. i just changed whte plugs and wires and it still does it. also it sometimes hesitates starting and turns over a few more times than usual. it doesnt have a loss in power either, does anyone have and advice?

 

Here is a list of items that will cause such actions.
1. Coil plug corrosion.
2. Problem with a harness at some point for grounds and crosses.
3. Fuel pump, relay or wiring.
4. Any connector problem.
What to do:
Check out all harness while motor is idleing, by moving them around.
Check fuel pressure and leakdown with a gage.
Does fuel pump run about a second everytime you turn the ignition on? It should!
Somewhere in all this you should get a lead on what the problem is.
Some of observations of trouble will lead to other parts of the system that may be the cause of the problem.