Alright, I'm basically pounding my head off the wall right now trying to figure this out. Setup - Stock d16z6, running a y8 crank pulley. Its in a 99 Civic EX with chipped p28 (stock z6 map), converted to OBD1 Problem - Engine misses a tad at idle, runs okay up to about 3500rpms, then misfires and stutters after that. Also, in order to get it running as smooth as I've got it now, I've got the dizzy moved almost all the way towards the firewall. Any other position makes it misfire throughout rpms I originally put the y8 pulley on because I'm running a y8 alternator and power steering, and though the z6 pulley wouldn't line up correctly. I've recently been informed that that is not the case, and that I CAN run the z6 pulley. But will that even change anything??