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Re: 1993 Chevy 5.0 no spark
Run the no start no spark test when it does it and find out.
Any codes or check engine lights.
Have you done the old pcm tap/twist test.
A bad pcm or dist module are sensitive to temp change.
If it is not a known good dist module replace it and see what it does.
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Remember proper testing gives us the answer to many problems.
MT
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