Chevy Lumina sedan 1990 3.1 runs great till it gets hot.?

A

at

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Once I drive it awhile and it gets warm or hot runs rough and chugs like a plug wire is off or misfiring. When I drive it after parking it at operating temp it will start but dies and doen't want to run. MISFIRERS.

What's Up With This Car? 144K Miles and has had regular matinance.

Thanks

Al T.
 
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