2g eclipse boggin down?

ok i have a 1998 eclipse gst, 2.0L DOHC turbo. its a 4g63, anyways when it idles the rpms just go up and down drives me nuts, its died a couple times. also when i try to maintain a speed limit seems like 40 mph or less its just bogs out and it shakes so what i do when it starts to do this is accelerate quickly or let off the gas. i have heard fuel filter, cats, distributor, ecm, spark plugs, wires etc please help mitubishi techs!!!! lol