1996 Infiniti I30 Car stalling

Engine Performance problem
1996 Infiniti I30 6 cyl Automatic 135000 miles

I bought this car used in 2008. It stalled frequently, I took it in and got the MAF sensor changed. It ran fine for a year but late 2009 it started stalling again, I got the fuel regulator changed and it ran well until a month ago. It has started stalling again. It stalls when at low RPMs (stop signs) or even going at a slow speed (Stalls often in school zones). In order to restart the car, I have to put it in neutral, rev the engine and then throw it in drive, causing the car to jerk violently. In addition to this when on the freeway, the cars rpms waiver a lot making the car jerk constantly. Often, when my car stalls and I attempt to put it in drive theres is a considerable delay between me pushing on the pedal and the car moving, sometimes as long as 6-7 seconds.