I've been working on this car for a few weeks now, starts up fine and idles fine, but when in drive, acts like its choking and cuts off. Has new fuel pump, plugs,wires, MAF sensor, i cleaned the EGR valve and throttle body and still does the same stuff. Running out of ideas of what it could be.

 

Have you tried unbolting the exhaust from the manifold (or running without the O2 installed)? Sounds like you may have a plugged exhaust.