could it be the ecu and possibly that the lower intake manifold i have on there is not exactly port matched? i just ported the outer ports upward the fit to the 6 port block.

 

ok. so i have the N370 ECU and correct US version TII wire harness on the way. we will see if this fixes the "doesnt want to start and run properly" problem. if not, then................

can a faulty omp cause it to have the problems i am having?

can a turbo with really bad bearings cause it as well?

these are the only two things left to fix/replace on the whole vehicle that could/would cause this.

expert opinions only please....

 

I know this is extremely late, but did the USDM ECU fix your problem? A buddy of mine in another state is going through almost the same issue you are. He has an S5 N/A A/T that has been converted to S5 TII 5spd. He is having the same problems and need to figure this out...