Ok so i decided to do what I thought would be a tune up to my 1990 4.0. Here is what i did; new fuel pump, fuel filter, plugs, wires, oil, cleaned TB and sensors, and oil and filter. at first i had a vac leak from hell but discoverd it was my TB gasket replaced it and everything ran fine (for about a week) Now when i go to start it first thing in the morning it will fire right up no problem, but when i put it in drive or just blip the throttle in park it dies out or will idle extreamly low and eventually die. If I start it and let in run for a few min without touching anything it will run fine and not do it the rest of the day. I am thinking it has something to do with the new fuel pump it never use to do this. Also this new fuel pump is louder than the old one you can hear the annoying BUZZZZZ even over the (absence of an) exhaust I have. Anyone else have or have had this problem?????? any help would be much appreciated.