I did A propane conversion on my 22re. It now has no power. I rebuilt the engine with 9.5 to 1 pistons, brand new head, crawler cam with no improvement. It's A bit hard to start when cold but idles and runs great. Its so bad I have to run low range on our logging roads. The only thing I know thats not suppost to be is it has the EFI ignitor/coil and the instructions say to use one off A carb truck. Could this create that big of A power difference and still run smooth?