2000 Firebird jerking

[SixtyNineFbody]

alright guys, i have a 2000 V6 firebird, A4, 60k miles, and the SOB is starting a little "hiccup" under acceleration. it doesnt do it when i am accelerating from a stop, but when i am steady cruising, lets say 40-45mph and try to accelerate, the damn thing starts jerking really bad until it kicks down into a lower gear.
and when i am on the freeway going about 65-70mph and try to accelerate to pass cars it does it even worse.
is it the tranny giving this trouble, or is it time for new plugs/wires? the car has no mods except for a K&N filter.

engine is stock, never touched other than the routine maintence (usually oil & filter change) performed by myself.

[Christopherrr]

any codes being spat?

4l60e's are notorious for overheating...when it does, shift's extremely hard and the converter doesn't lock up. I doubt this would get your issue though, a bad tranny doesn't make engines "hiccup"

I'm willing to bet it's a bad coil pack...60K is still pretty young.

is your idle smooth?

[SixtyNineFbody]

it idles great, and when the cruise is on it runs fine. accelerates fine from a stop, etc...
its just when i try accelerating from a roll, light acceleration. but when the tranny downshifts the engine revvs fine. i think it's been about 30k since the last tranny flush & filter.