Hey Guys

The car starts to bog down when trying to accelerate from a lower rpm (say 2000 to 3000), but beyond 3500 it's fine. It's like it misfires, or bucks, stutters, whichever word suits you haha. It only happens when the car has warmed up, and you really notice it while highway driving.

So far i've tried: New cap/wires/spark plugs, new fuel filter, a bottle of injector cleaner. It happens regardless of how much gas is in the tank too.

Starting to get frustrated. Any ideas?

Thanks