starting issues with 89 buick

[KiloJKilo]

Sometimes when I start my 89 century (3.3) fuel injected. It cranks and cranks and cranks but doesn't turn over. I stop, and start cranking again and after about 3 seconds it starts to catch and finally starts...it sputters and putts and almost nearly dies unless I give it gas. Sometimes it does die if I do not give it gas. As it starts, sometimes I little puff of what appears to be white smoke out of the tailpipe and I can smell a bit of gas. I shift into drive and as I go, sometimes it hesitates. When I come to the first stop, it almost ALWAYS hesitates when I leave again. Never does it a second time. In the morning, I NEVER have the starting problem. I described this to a mechanic and he said that's a standard problem on GMs, and provided little more information. My 84 caddilac did the same thing. Any ideas? Thanks, Kevin

[maxwedge]

look for gas in the fuel pressure regulator hose, check fuel pressure also when this happens, very tough to diagnose on the net.