stupid question

[greenrt_se]

Can some problem in electrical circuit make motor idle quality bad??  my charger motor shaking in idle speed,vaacum is steady (14")
demon carb(new) and A/F ratio is ok, in idle speed,motor is whit: 0,030 2355f piston 0-deck
                                                                                          223/228 0,050 Hydraulic cam
                                                                                          1,6:1 roller rockers  pre load 3/4 turn
                                                                                          84cc E-head (out of box)
                                                                                           RPM intake
                                                                                           hp exhaust manifold
                                                                                           new timing gear,damper,piston rings
ignition is MSD ready to run distributor,blaster coil,ngk plugs
I have ground wires hook to the head?? next I put them to the motor ears

[Ghoste]

It could but I'd cover the basics first.  Are your plug wires new?  Are they all on?  You need to find out which cylinder is not firing.

[Chryco Psycho]

I have had constant problems with NGK plugs foulfing & misfiring , Use Champ or Autolite