I've been having problems with starting when the engine is hot. It happened again just now, I make a quick stop at a store, maybe 5-10 minutes, I hop in and try to start it several times and I get half a crank each time. The mechanic nearby used of those portable jump starters and it worked. He thinks my timing is off. Motor is tbi 4.3 chevy. The other times I've had this happen, it would usually start after I let it sit for about 15+ minutes. Starts ok when cold and even after sitting for 2 weeks; cranks perfectly. Happens when the engine is warm and I shut the engine down briefly. Battery is new and I got one that has a higher cranking amps than what's recommended. I re-did one of the butt splice at the solenoid wire to fusible link thinking that the connection there wasn't good but that didn't help. I rebuilt the starter about year ago. Any ideas? I'm most worried when making a left at intersections, I know if I stall, I wont be able to start it. I've had to wait several minutes at a gas station once before it would crank continuously and start.