Sputtering on accelerate

My 98 jimmy is sputtering on accelerate. I have read that I should try an acdelco cap and wires but I was wondering if that would be it cause it only seams to do it when it is raining or damp in the morning. Any help would be great!!! Thank you

I would change cap, rotor, and wires. That moisture is causing you to lose spark somewhere.

ACDelco is the gold standard for all things GM.