I have a 1988 chevy caprice, and I have a hard time starting it. It runs fine when it starts, but after I shut it off, I can't get it started again. It turns over, but won't start. It floods up on me. I have to keep the pedal to the floor for about 30-45 minutes before it will start. What could be the problem? Any advice would be appreciated. Thanks so much. Ps. I've been told it's my choke. Do you think it could be this, and if so, how could I get it fixed?