Pontiac Repair: 1995 pontiac transport, pontiac transport, catalitic converter

Question
runs while park then loses power while driving down the road
when you shut it off and turn it back on it runs for a little
while then does it again have changed the fuel pump,fuel
filter,ignition control module,spark plugs and wires still
doing the same thing please help

Answer
Hi Sharon:

I would look at 2 things either fuel pressure/volume or maybe a plugged / restricted exhaust from a bad catalitic converter. The fact that it looses power is a tip off to either one of those 2 things. The only other thing is when it looses power does it feel like it only running on 4 cylinders and run gough or just plain lack power. If if lacks power going down the road if you pull off to to the side of the road and put the van in park or neutral and try to run the engine speed up does it? or does it lack power still?