Brand new cap, rotor, points, condensor and coil.

Still run rough only at idle very peppy and responsive otherwise.

Weak fire on cylinder #4 at idle when wire unplugged. Wires changed 03/09 with Napa Blue BMX (about 14K ago).

My feeling is the #4 spark plug wire is the problem. The engine was running smooth a couple of weeks ago and it happens only at idle as missing intermittently on one cylinder.

What do you think?

Weak spark, valve burnt , rocker adjusted too tight, bad spark plug. Get a compression test done might tell you. My 2c worth.

Weak spark, valve burnt , rocker adjusted too tight, bad spark plug. Get a compression test done might tell you. My 2c worth.

If you tried to scary me. It was just fine tuning carb adjustment and balancing after tune-up and timing advance.