Misfiring K75

[nortonbrian]

Hi Guys,
             I need some help, my sons 92 K75 has an intermittent misfire, the one that can drive you nuts. Cleaned checked and replaced just about everything. Starts and idles fine but breaks up when you increase the revs. Swapped out the EFI unit, purchased ignition box and HES on ebay, no cure.
I would like to beg, borrow, rent or purchase an ignition box and HES that is known to be good just to eliminate these from the problem. Checked wiring but its fine stationary. I am a real person, same job and home for 20 years. Been tech editor for Norton club for 33, if it was Lucas I would have no problems!When I get this problem solved, I will share it with you all, but hope you dont have to experience it!
thanks
Brian

[ackgs]

What do the plugs look like? Could possibly be injectors too. Maybe a good dose of Techron would help.  Has it been sitting? When I got mine running after it's hibernation it exhibited similar symptoms, sent the injectors off for cleaning and the issue went away.

[WayneDW]

Hey Brian, what's your location?

[TimTyler]

Checked the exhaust valve clearances?

[Chaos]

water in the gas tank can do strange things.  see if a bottle of HEET helps