3.1 V6 runs rough when I accellerate it

Hope someone can help. I have 95 cutlas w/3.1, History- One day my car started running rough after I went into passing gear. It runs great when I start and acellerate slowly, but if I'm more aggressive it starts running rough (city or freeway) if I put it in neutal and re-start it it runs smooth again until I give it more gas.
I've changed the fuel pump and filter, plugs and wires, I was even talked into have one injector replaced. any ideas
Frank

Welcome to AF, any check engine lite? Is this an dead miss in the engine under load, can you pinpoint the cylinder? The query is too vague, what you describe can be attributed to many things. Checked fuel pressure under load?

Don't know how many miles on the engine but sounds a lot like coil pack problems to me. I had 2 coil packs go out within a couple of months of each other and the car had around 110,000 miles on it. I was having similar problems as you decribe.