[Riftcloud]

I need help with my '99 blazer V6 4.3L vortec. I was driving down the interstate the other night when my engine started chugging when I would push on the gas. This happened a few times and then my engine just died. I got it home with a tow truck, and a friend has helped me work on it. We've changed the fuel filter, checked to see if pressure is coming from the fuel pump, and it is. We changed the spark plugs, and now the engine is still acting the same. If we can get it to start, it idles just fine, but when I push on the accelerator, it starts chugging and acting horrible, and if I don't let off the gas it dies. After a while at idle it starts dying on us again. Any help would be appreciated.