Hey guys I have a similar problem. I have a stumble and popping sound coming from the intake during hard acceleration. I have a tt chip, #60 injectors, 87 ecm, walbro 255 fuel pump, accufab fpr, hot wire kit and a big mouth cold air intake. It's a hot air 85. My mechanic can't figure out what the problem is. He installed the mat sensor from caspers and a snow performance alky kit as well. I need help please. It's been in the shop a month now and we can't figure this out. Any ideas would be great.