Bought another teg, this time a gsr, runs great for awhile. Go on a bit of a trip and it develops a misfire that is slowly getting worse. When you start off it bogs the second you put your foot down. Anything over 10% throttle and it starts to miss. If you rev it out it will start to do it again at like 5000rpm and after 6000 it pulls like new. Tried new distributor and nothing and tried new tps and nothing.

 

Did you check fuel? Check at least fuel pressure. Had rhe sams problem with new lsvtec swap and it turns out to be the brand new AEM fuel pump i installed. Had the pump in for about 50 miles till it crapped out.

 

You where right, swapped the fuel pump and she's running like she came right out of the dealership