Mule 3010 has no power. in low or high it goes maybe 9 mph, has new pump, spark plugs, checked the vents, nothing is helping

here is service manual look into cdi -plug as possible problem use trouble shooting guide -------- https://manualzz.com/doc/57493589/kawasaki-mule-3010-trans-4x4-service-manual

The 3000 mule I have worked on has a coil, wire which screws into the coil and spark plug boot.
Do you have power and ground connection at coil.
You said you replaced coil did the wire and spark plug boot get replaced also.
If there is any question about the connection between the coil, wire and boot you might try removing the coil, wire and boot from back cylinder and placing on front. Swap them and see if you loose spark on rear plug after swapping.
Just a thought.

https://www.manualslib.com/manual/803081/Kawasaki-Mule-4010-Trans-4x4.html?page=37
You did not say what model you have
https://www.kawasakimotorcycle.org/forum/kawasaki-atv-mule/152674-2012-diesel-mule-4010-no-power-steering.html
https://www.kawasakiforums.com/forum/general-tech-9/kawasaki-mule-3010-trans-4x4-640/

Hey Keith, get a manual.. its easier than trying to "diagnose" on here.. Sorry..good luck.. kawasaki mule 1000 450b1 repair manual Google Search

Full tune up and carb clean .get new plug,air filter.oil Chang ,carb clean and adjustment.that should do it.,., try fuel filters and test fuel pump see if it's functioning properly.,.

Check ignition switch. Should have power on red wire at all times. If power there check power out of switch.

Air leak .dirty air filter.,.fouled plug.,.bad gas.,.dirty carb?fuel injection? Bad fuel filter ,fuel pump test fuel pump that's the general stuff.go from there

Sounds like a bent axle.... or something in the rear differential. ...the heat generated by the bent axle will cause all the clearances to disappear!!!

Hello Anon..
First, I would check to make sure the carbs are getting fuel, and then fuel getting into the cylinders. Your question about low oil - did you let it get low and then it quit? ...
If you put oil into the cylinders and only got 100psi, this might be your problem. You should be pumping around 120+psi without putting anything into the cylinders... Recheck the compression.= .take out all spark plugs...screw the gauge in until the o-ring seats, hold the throttle wide open while spinning the engine over for about 5 seconds... you should get 120psi +/- 10psi.
If you are getting less than 100psi.. it might be time for a rebuild..