Tweaker: Bucking clarification - it was occuring while in the correct gear and not right after clutch engagement; with agressive throttle postions after 50%. I would say clean the hell out of your intake track, check your TPS sensor for correct voltage, replace your fuel filter (if it hasnt already), check out the MAF sensor, and one other item to "make sure of" is to verify your plugs are gapped correctly and are at-least double-platinum plugs and that the wires are 8mm. (I got 9mm Ford motorsports.) Hope that gives you some avenues
Kate: I think the best thing to do is take your car to a EFI specialist who can take ride with you and do a running scan on your engine to see if your running lean, see what all your sensors are saying to the car's computer, if something is out of range, etc etc that would be a very good start I think - plus (in this case) you would'nt have to worry about a dealer-tech trying to screw you out of warranty work. I would also suggest (if you have the spare cash) doing what I did - get the Ford motorsport 9mm plug wires and the champion double-plat plugs (gapped at .054)... just to make sure it is'nt a problem (or contributing to the existing problem) with plug voltage getting to the plug or sparking accross it... I know you said you are having a fuel pressure drop - but has this been confirmed by a Ford tech during testing? If they do see an unsual fuel pressure reading, they see the problem and need to fix it. If this is all caused by fuel pressure, I would look for kinks in fuel line, make sure filter is clean (you had the pump replaced already, if I read your post right). I hope this somehow helps you.
