I'm pretty sure its fuel. I can start it no problem with starting fluid until I can get my hand to hold the throttle down then i transition to my hand to my foot (its a real pain in the ***). then I have to keep the throttle down about 1/2 way at all times or it will stall. all fuel components are warm not frosted or cold.

This lift has been sitting for 2 years. When I first did compression check it had 30-60 I sprayed seafoam and also some marvels mystery oil on valve springs and pushed them down. It must have cleaned the valves up enough to get them to function right because now compression is 180 each cylinder.