Need some help on my Daughters 35th anniversary edition. 2.5 with auto. She has mentioned to me that about once a week or so the car feels like its jerking or missing. I was not able to duplicate the problem until a couple of weeks ago. She went out of town and I drove it for a week or so and sure enough I happened to me. Didn't do it very often but when it started, it jerked or missed for a couple of min. It felt to me like a cylinder was not firing. I suspected the plug or wire. I purchased a new set of wires - the motor-craft OEM stuff and pulled all the plugs (new about a year ago)and checked them. None of the plugs were fouled or looked different then the others. Didn't fix the problem, Next, I replaced the coil pack with one that i had that i new was good. Still no fix, Sunday I worked the 3 big plugs by the power steering pump, pulled them apart put them together with some electrical silicon and made sure they made contact. She still has my pickup and I drove it this afternoon and sure enough still feels like its missing a fire on one of the cylinders. Seems to be worst at about 45 mph, Starting to think it might be a fuel system problem- pump has not been replaced, but the filter was. What confuses me is that it idles clean and consent, from a cold start to a hot start, Fuel tank is full, when its not messing up I can cruse on the highway at 80 with no problem. I can not make it screw up no matter what I try but it does it about once every 3 or 4 days and then for about 10 min or so. What do you think is next. I'm ready to pull the UIM off and check the connection to each fuel injector and maybe the injectors themselves and also look for a gasket leak on it or the LIM. Help!