i cant figure this one out, i have a 93 grand prix le 3.1, when i drove
it it would dog out while driveing as if it was clogged up, no power,
just putting, so i put a new motor in it. out of a car that was running
good, the same dogging happened, so i replaced every sensor, erg valve,
new plugs gapped out 45 thousands, new wirers , new coil packs, and new
ac delco ecu, everything has been replaced with new,  not used or
remanufactured, now it will run but still doggs out, and at times it
comes out of it and runs like a champ, then a few miles down the road
it will dogg out again, sometimes it will run good for  10  to 20 miles
and then start dogging out, and  when it is dogging out  if i  let off
the gas  quick and  repress the pedal it will pick back up and run good
for a few  miles and then start dogging out again, i am lost i have
replaces everything with no luck, please help me i am about ready to
dump into a pit  and wash me hands of it. thank you any body that may
know  what the hell is gooing on with this car.