Car not starting.

[91autoeclipse]

91 GSX..automatic ..I have the alternator tighten.. and the squeal is gone but now.. it wouldn't start.

heres what happened:
It started that first time I cranked it up.. I step away for a mintue and came back to go to work.. it was dead.. it has not started since.. It would crank and turn over.. everything works.. just not catching..on..

History: It would bog a little when I was driving.when it was not fully warm up... it does this for a while before it did not start.. I thought it was just to cold ..
On hot or warmer days it would die after you've being driving for and an hour or fully warmed up... when rpm drops below 650 RPM. it'll just drops then die..

what I did:
I checked the spark plugs..Damn my sparkplug socket get stuck in the hole..had hard time getting it out.. wires are new. I'm leaning toward fuel pump..
Is there something I should check before I get a fuel pump..??


Thanks,

tsua