yeah im having this same problem too. ive had problems with splitfires though. ive had to send three back so far. had car running perfect again after sending back splitfires when i went over seas. just got back after 14months, useless brother wasnt starting it up every few days so pretty much sat there for over a year.
then they started it up just before i got back and it was running terribly so took out my wolf3d and put stock ecu back in. would run ok but miss fire at 4500rpm. so i figure its another splitfire coil pack. think i may have received a dodgey batch or something considering its the 4th one to die.
put the wolf back in so it ran ruff unplugged each coil to see which one made no difference. this is how i diagnosed last three times, replaced with a stock one and ran fine again.
this time thought it was the 5th one, changed for stock one, runs ok at idle now but still mis fires at 4500. so put stock ecu in again but still the same.
has gotten worse now sometimes doesnt even idle with stock ecu now. and can missfire anywhere through the revs as low as 2500rpm. seems to come and go with the missfire at idle but at 4500 does it everytime
not sure how to solve this one. possibly two coil packs gone at same time??? wiring loom? tried to search for "how to test coil packs" but couldnt really find an answer. any suggestions?
cheers