Ok , i have first a 1990 crx with a zc in it ran fine but would die and have no spark. changed the coil ran about 1 hour and died idling. the rex came with a cut up harness so i replaced it with 88 si harness. the car was originally a dual injected. The distributor seems to be grounded. and has power on the black and yellow ign. lead. Next i have a 87si runs great but at lights it revs to 1500 and goes up and down on the idle . Whats up ? what do i need to change? runs excellent on the road but the lights suck!