While driving t before the automatic transmission is going to shift there is a slight hesitation or really rough running period of a coupple seconds. I was wondering if it could be the injectors or mabey timing belt/chain.
Thanks,
Scott

have you replaced your plugs and wires, if not try doing that and it should fix it

And a note, as always, to make sure you only use AC Delco plugs and wires, as those who don't, usually end up replacing them again with a month or two. Don't know why this is, just know that anyone who has not used AC Delco has had problems almost immediately.