1996 Chev Monte Carlo Won't Start - Ignition System

Question: i can start my car and run it for half an hour to an hour just fine, but if i let it idle after that for 15 minutes it starts to miss out and quits running and wont start up for atleast 3 hours. it also does it if i shut it off after running it for an hour down the road. i shut it off it wont start up again for about 3 hours. ty you for your help, Benny Wright

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Owner: i forgot to tell you that it is a 3.1 v-6
Owner: my check engine light does come on and i had it looked at and all they could tell me that it was an o2 sensor on the left bank that was bad. that didnt help my problem when i changed that.
Technican: Sounds like you have a coil pack going bad with the ignition module under the pack that is breaking down when it gets hot. They are both very expensive, so I would replace the module under the coils first.
Owner: could you tell me what that is and what it looks like and where to find it on the engine
Technican: Could be on the front, back or left side of the engine. It is a box 3 x 9 inches long. There are 3 coils that have 2 plug wires each. The module is underneath and you will have to remove the coils to get to it. If you trace the plug wires you can find it.
Technican: The check engine light will come on when your engine missfires & when it does the O2 sensor reads that the unused fuel is too rich in the exhaust.
Owner: ok ty very much
Technican: Also if this does not correct the issue try to open that gas cap and see if the problem goes away. I have seen similar probles with a faulty gas cap. Also please to not "release" the question but respond to the question. Releasing does not allow me to continue to work with you and opens your questions to other mechanics while a reply allows me to continue to still work with u thru this problem.

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