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So my 86 3/4 ton suburban will idle all day but as soon as I start to drive it or reverse it, it has no power, I can push gas pedal all the way to the floor and engine stays just at idle and then stalls out. It will start back up over and over but won't drive. I've replaced the lift pump, the fuel filter (square one) , and installed a new electric fuel pump on the line before the LP. I've bleed the system to remove air and I've tried pressurizing the fuel tank. I have not found any leaks and I don't see air in the system so i don't understand why its doing this. Any help would be much appreciated! Thanks! I have read through a lot of posts and every time it leads me to think there's air in the system but with a clear tube on the IP I have no bubbles so I'm stumped.