Power-loss

[Everyday Medic]

I have a 2012 Hisun 700 EFI, marketed in Canada back when I bought it under the Name "Power Max Rough Rider" I have had my issues over the years that always seem to come back to poor "economical wiring" 

My issue is that on occasion I have a sudden and temporary loss of power. This occurs at two diffrent times. Both after the machine is good and warm.

1. Cruising down the road, the power will suddenly drop to nothing, I can press the throttle and habe a slight raise in RPM* but not high enough to engage clutches. This will last about 10 to 15 second, and of course right before I have rolled to a total stop, she come back on line. 

2. Lower speed work, I plow with this machine. I will say come to a stop and the machine will not idle but drop down to well below idle and then die, upon  restart the RPM does not come up to idle speed, but choke around 500 then die again. This occurs a few times, then we are back to normal. 

*the RPM guage drops to zero even with the engine still running (digital) then when the unit returns to normal it also works. 

I still have full electrical at all times. I have a few modifications on the unit. I run a double deep cycle/starting marine batteries in the winter, as I plow, this means I use the wench alot. I have an LED light bar, and added a hydraulic pump to turn the plow. Lastly a small heater core with a small fan to keep me warm. 

I will also note that the speedometer has not functioned in a bit, just reads 00 I figure this another "economical" wiring issue, that I really don't care about, unless it's leading to another issue. 

I have had to rewire a few things, like a few connectors. Replaced some wires that have shorted, or oddly have become damaged. I have changed a few relays, and the 4x4 switch, and servo. Any extra ls added have been added on a seprate isolated circuits thru its own fuse box. 

I have a very mild thought it may be a throttle postion sensor. 

Hoping someone can lead some insight, or at least point me where to begin investigating.

I would love this fixed, I have to drive down the road to get into the back section of the property where I shot. 

Thank you.