boggish acceleration ?tranny?

Hey whats up guys, havn't posted here in awhile, but im back and with a question! i have the 94 v6 3.4l model and lately this problems been getting worse. When i start the car the service engine light isn't on. but after i drving around sometimes within minutes, others after about 25 minutes and ON DEACCELERATION ONLY the service engine comes on, afterwards the engine starts to run hard and the rpm's kinda hesitate and jump. For example i could put it to the floor and it hesitates then out of no where accelerates like it's supposed to. Im not really sure what the hell's going on cause its only when the service engine light comes on, what would be my best way to figure out what's wrong and any suggestions? Thanks guys =)

Take it to autozone and run it for codes. That would really help narrow it down to the problem. There's just too many possibilities to list of what could be wrong.

I say probably the ICM but yeah run it for codes before throwing money around.

alright thanks guy's i'll try to do that tomorrow if i get a chance, and i'll update on what the codes say and ask for help with possible solutions.

Sounds Like Possibly The Coils Have Gone Bad.

Check codes! Tune it up. Change catalytic converter if its never been changed.