hey guys,
I recently had my cooler piping redone in my silvia so my bonnet would close properly it has any rb20det in it, anyway when i got it back from the place i had redo the piping.
I took it for a drive and high in the rev range not quite sure where (have not replace tacho yet) it looses all powerand miss fire's badly for about 30 seconds during and after giving it a bit of throttle and then idels fine.
you can rev it on the spot and it is fine it is only when driving when it is under load.
I think it might be a coil pack but i tested all of them with a multi meter and they all have the same reading and the spark plugs are fine they have been in ther for about 45000 there iridium ngk plugs what do you think is wrong with it i also found that the place i had do the piping did not clean out the piping properly it had metal filings still in the piping still have to do a compression test but the power delivery is fine untill it starts to miss fire so i would assume that the compression is fine, it seams to be ignition to me but please
Help!!!!!!!!!!!!!!!!!!!!!!!!!!!