Stall problem

[Bob Ludwig]

I have a 1996 Ranger with 4.0 and 5 speed. Recently while driving away from a stop sign it just stalled and fell on it's face, I let up on the throttle and then pushed it down again and it took off but then stalled again. It acts like the ignition turns off then back on. I jacked it up and put it on stands with the rear wheels off the ground. It runs like a charm and I'm unable to replicate the problem. Off the stands and begin to drive and it stalls again. I've replaced the fuel pump relay and idle control sensor. I'm at wits end !!!
Anyone else ever have this problem or any suggestions ??

 

[RangerAl]

Basic tune up.. plugs (motorcraft), wires, fuel filter, air filter, clean MAF sensor, check for crank sensor connector for oil leak, and finally the cam synchronizer sensor (where distributor used to be).