I am experiencing an occasional blowback thru carb. Occurs once every 1/2 hour or so at @ 2900 - 3300 RPM. Replaced Plugs, filters, wires, cap, rotor and checked timing.
Any ideas?
Sticking intake valve comes to mind. you may have a lifter going south. or a intake valve spring problem. Or just a valve sticking open for an instant.
Thats all i got.
