'92 S10 Blazer - Start/Hesitation Problem

Any suggestions?

I have a '92 S10 Balzer, 4.3 Vortec engine (spider injector), 145,000 miles.
Recently I have a few problems:
1) Hard start - I have to floor the throttle while cranking to start it up.
2) Once started it idles fine - but pulling away from a stop and it will hesitate like it's missing or starving for fuel. Floor the throttle and it will work itself out. Once driving at a steady rate and transmission shifted into overdrive it will chug off and on. All this hesitation and chugging seems to get worse once the truck is warmed up.

Last but probably not related to the above
3) Leaking oil - which appears to be a rear main seal.....

For 1 & 2 I am thinking a fuel problem. I only mention number 3 because everything seemed to happen at the same time - or very close to the same time. I noticed the oil leak getting worse and now the hesitation and start problem is getting bad.

Any suggestions?

(plugs, wires, dis. cap, rotor are all good; EGR valve changed last year; new PCV; fuel pump and sending unit about 2 years old)

well pull the plugs and see if one side is worse than the other, from my experince when I had to put the pedal to the floor to start mine it was the spider assembly. Now before that I had a fuel regulator that was bad and a leaky fuel nuts. Pull the intake off its very easy takes about 15min. if you got puddles of gas on the passengerside of intake then fuel regulator if its on the drivers side then leaky fuel nuts. Best and cheapest way is to get the nut kit and replace the spider assembly , im a average back yard mech so others might suggest other things to look at but this is what fixed mine and my milage went up 21.3