[fear1209]

ive got a 1992 chevy g20 conversion van it has roughly 166k on it
engine is the 5.7

i started up the van and it ran / drove fine for a about a 2 mile run on the freeway, as i got off the freeway it started acting up i gave it gas and there was a flat spot with no response had to hold it about half way down.

anyways i got to where i was going and put the van in park then it just died / stalled out.
i turned it over it fired right up put it in gear was fine however as soon as i touched the gas pedal it died again. this time simply turning it over would not start it.

i held the gas pedal to the floor and after about 10 sec's of cranking it started again nice big puff of black smoke from the tailpipe aswell as a strong odor of gas. put it in drive again it died now it only starts if i hold it to the floor and it lets out a nice puff of black smoke everytime.
it will not idle unless i rev it up really high for a min or so then it will sometimes idle on its own.

but stalls once its in gear or you touch the gas pedal. feathering the gas pedal has no affect on it at all to prevent it from dieing.
there was no check engine light on and there are no codes stored any ideas would be great.

also on a side note not sure if it could be related if i turn my left blinker on my speedometer needle starts to bounce up and down intill blinker is canceled. and if you turn the headlights on the speedometer stops working altogether.

thanks in advance.