Ok techs I’m stumped, this recon is a friends….it’s had popping out of the carb an exhaust, when it runs the motor will rev, but when it idles down it will start backfiring from both an quite! As long as you keep the RPMS up it will run, but it does have a bad miss while running, now the steps I’ve done to try an fix, are as follows, I’ve removed fuel tank an cleaned it completely, carb has been replaced with new one, spark plug replaced, all lines involved with fuel an vacuum are new…also there is no irregular engine noises. So do you guys think it may be ignition coil breaking down? Or cdi box issues? Any help is greatly appreciated [emoji848]

Sent from my iPad using Tapatalk