390 has miss at all throttle speeds

[kapejo]

Have newly rebuilt 390 with 2000 miles on it. Has new plugs, wires, points, condenser, vacuum advance. Timing, dwell, points, and plugs are all within spec. Cap and rotor appear to be in excellent condition. Checked running motor at night .... no fireworks.
Engine has a miss at idle and throughout throttle range. It has poor acceleration. Any thoughts on to proceed or troubleshoot?

Thanks,
John

 

[boaterbob]

Can you bring motor back to rebuilder? That could be various things. Is dizzy put in correct not 180 degrees out? I would advance timing and see how it reacts. wires on in correct locations? Vacuum leak?

 

[boaterbob]

Also what is condition of Carb??

 

[Terry64HT]

Make sure the no. 6 plug wire is between nos. 7 and 8 on the wire loom. 7 and 8 need to be kept as far as part as possible to avoid missfires.

Terry
64HT

 

[kapejo]

390 Misfire

Thanks Terry....your post resolved my issue.

John