Ok so i have a 93 civix ex with a d16y8 obd1 swap and it was running fine until the distributor got messed up and i changed it for a d16z6 one because the one for the d16y8 wouldnt plug in due to the harness having 2 plugs but anyway now after that everytime i go past 5k the tach needle starts bouncing crazy and i have no idea what it can be and the car is running fine it pulls like its supposed to and idle is normal, any ideas?