I have a 22r which has been converted to propane with a gotpropane propane only kit. The truck runs like a champ, good power, climbs verticals without missing a beat. But when i go down steep hills or drop off ledges, it will die. One of the reasons I converted to propane was to fix this, as all three of the aisin carbs i had were worn.

Does anybody have any ideas on what could be causing this?

 

There was a guy on mud that had his truck cutting out on right turns and it turned out to be a bad coil. If you don't have a fuel delivery problem, perhaps it's ignition.

 

I'm being stupid here 'cause I've never dealt with propane conversions. When using a propane torch, if you tip the bottle up with the torch tip down the torch flares and attempts to degrade because it's receiving liquid instead of gas. It might be that you are flooding your system with too much liquid fuel instead of vapors. Can you reposition your tank so that in a descent angle it is drawing in more vapor and less liquid?

 

I would try to turn the propane tank around and if it dies going up hill then you know it has something to do with the orientation of the propane tank. You are likely sloshing the liquid propane away from the dip tube when you go down hill. See in the picture below, if you have a similar tank and the valve of the tank is pointed toward the front of the truck, when you go downhill all the propane moves away from the tube that sits at the rear of the tank.