good day.i have a problem with a 86 code f iroc .just rebuild the eng to stock specs after original engine spun bearings. best guess for damaged eng is timing.orig eng had 66,000 miles was well taken care of.new eng runs great when est wire is unpluged,but run rough when plugged in.all connections are good,timing is 6 degrees,vacuum is good.new esc and knock sensor.this a very orignal low milage car bought new.how would i troubleshoot this?tahnks