This is getting very annoying maybe someone can help me. 87 big bear 350 was running great and all of a sudden one day it started cutting out above half throttle.

Here’s what I’ve done, took carb out and cleaned it three times. Nothing is plugged.

Put wideband air/fuel data logger system on it went for a drive, when it stets cuttin out it was a little lean (15.3-15.7:1)

Then I jetted up so it was a little rich, tight at 13.2:1 when it was cutting out.

Then I changed to a new coil. No difference

then I heard something about the rear hand brake switch causing a rev limiter so I ohmed that switch out and it is fine.