"I restarted it with a lot of throttle"- - - - - -to paraphrase, "I held the throttle wide open and cranked until it started". Is that correct? If so the engine is flooding. Find out why, and fix it.

Have you done the volume/pressure/vacuum test on the fuel pump yet? Didn't think so.
Jerry



"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!