89 hesitating and stumbles

Can anyone help me?? I just purchased a 89 chevy suburban. It runs pretty good all in all, but lately when I accelerate from a stop at a very low speed, the engine hesitates. This is more noticable when the engine is cold. Ive pulled the plugs and they all look fine. Any suggestions ? Brian

For starters and a cheap fix if it works. Try a can of SEAFOAM in the gas tank. It's only about 5 bucks.