I have a LS 190.B skidsteer and it will run fine when it is cold. but once you warm it up and try and rev it up it starts to misfire. It will idle fine. Once the cold timing advance goes off it starts to misfire once you rev it up. It doesnt misfire just idling. It has a rebuild injection pump on it. I checked the line coming out of the tank and didnt see any bubbles when i put a clear hose in line.