I have a lift in the shop right now that will start fine when its cold, and will typically start if it is shut off and immediately started back up, but if its hot and sits through a heat soak for a couple minutes, it will not fire back up unless you either choke the throttle body manually by hand, or shoot a little brake clean or ether into the throttle body. The LP injector is getting voltage at both sides, but no pulsing ground, but even running a jumper to the injector and manually opening the pintle, it will not start. I am not losing spark and the fuel shut off is working as it should. I've already tried advancing the timing and enrichening the AFR, but the issue remains. I have also already drained the propylene from the mixer. any input will be appreciated. all fuses are good and have power going through them.