87 Buick Electra Park Ave

I seen a post on here about a 90 Buick Regal thats doing about the same thing as myne. I have replaced the coil when i got the car. it ran realy good for about 3-4 days after replacing the coil pack. now it doing the same thing. When warms about 1/2 way between C & H it starts to miss, sputter, act like no gass, then will die. some times will restart for a wile but then stalls out. other times will not restart till cool. Any sugestions??