So I am having issues my 89.5 Si(89 2.0Si swapped to a 90-91 2.1Si). It will run fine until around 2750-3500rpm. It will shut off and coast in gear. If I flip the switch on and off, it will run until it shuts off.. At 4k+rpm it pops and sputters. I have already replaced the fuel filter last night when the problem occurred more often. Anyone else have this random issue?