i know what you mean i think, it wont flick to gas when engine speed revving up, it does on the way down. mine does this, engine speed has to meet at least 1400rpm and be slowing for the change to take place, i did hear this speed is adjustable so maybe it can be set to zero, find a lpg dealer who can plug your ecu into their computer, i think thats all it takes, as opposed to plug their pc into your vehicle!! maybe???