86 TRX350 Not running when in gear

I have an ’86 FourTrax. I’ve done a lot of fixup to it, but it has had a problem since I bought it which was about a year ago. The problem is getting worse. the 4wheeler will start, but intermittantly when the shifter moves (even a little) from neutral it wants to cut off. If I let go of the shifter before it makes it into gear, it will continue running. I have the wiring diagram, and after study I can’t find anything that would cause this. I have seen something called "DC Consent" and it looks like this is the one thing both the reverse and neutral switch have in common. Does anyone know what this is? How about where it is? I will take any advice. It is nearly unusable the way it is.