My '89 GTA, 5.7 TPI will sometimes feel like it's running on 7 cylinders (usually up to several hours after being used) and when it's like this it will crank but not start right after you shut it off. If I wait about 10 minutes it will start again. Sometimes it will run good, sometimes it will feel like rough/weak like not all cylinders are firing.

This weekend I will be going over the car and doing a full tune up but I have a feeling something more is wrong. Does this sound familiar to anyone?

thanks in advance!