Floor it to start

[Hightopg20]

My 93 g20 350 TBI van ran great when parked.(ran low on gas) Went
to start two weeks later and will not start without flooring the pedal. I
took it to the gas station and put half a tank of gas in it. Even after
it starts it idles rough and unless I floor it to give it gas it will die. It
looks like enough gas is getting into the tbi and when it's roughly idling
the exhaust smells like gas. I changed the cap and rotor and it's getting
spark. I even put an msd box I had on it and still no change. Please help
I'm going on vacation in a couple of weeks and the family's counting on
me to get the family truckster going again. Thanks