I have a 94 sport. I blew the heads out of it last fall. installed new heads.it hast ran decent since. ran the codes, always came up with the egr or one of it's controls replaced all 3. still ran I shit. there was really no fuel pressure at times ,so replaced the fuel regulator., then the fuel pump and filter. along with the mass the mas flow senor. it idles very nice at times, then lopes along, bearly running at times. running it. is something else.it either has all the power you want or nothing. it gives you power down the road for about 2 miles then , no power for about 3 miles. then cycle will start all over again. can't find any leeks of any kind.no fuel leeks, haven't lost any fluids, that I can tell. could the fuel injectors. be the problem. need this running by the time snow flies in south Dakota. hope someone can help. one more thought. I do not have a fuel pressure gauge. but even now. I can turn the key on listen for the fuel pump, when it shuts off. I push the valve , where you would put a fuel pressure gauge. and their is no pressure in the fuel rail. there is no fuel leeking around around the fuel in jectors.