Take your air filter off and the flap in the front portion of the carb is the choke. With the engine fully warmed up, the flap should be completely open. If it's closed at all with a hot engine, it needs to be adjusted.
With the engine cold, move the throttle linkage all the way open, as if you were stepping on the gas pedal, one time. The flap should close by itself under spring tension. The tension should be fairly light. If it slams shut under a lot of tension, it needs to be adjusted.
Check all this before you start adjusting anything. If it does need to be adjusted, mark the choke housing with something so you know where your starting point is. Loosen the screws a little on the round, black plastic choke housing. (passenger side of carb) Do not remove them, just loosen them enough so you can turn the housing back and forth. On a cold engine turn the housing till the flap barely closes. You don't want it to be under a lot of tension. You want it so it just barely closes nice and easy. On a hot engine, turn the housing till it's open all the way and then a hair more to hold 'open' tension on it.
You'll have to play with it a time or two to get it dialed in right, or follow these step by step instructions. The choke adjustment is toward the bottom of the page.
http://www.autozone.com/az/cds/en_us/0900823d/80/19/c2/7e/0900823d8019c27e/repairInfoPages.htm
http://www.autozone.com/az/cds/en_us/0900823d/80/20/51/55/0900823d80205155/repairInfoPages.htm
Welcome to the world of Q-jet tuning.
Mark
