He broke it.....

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1988 420 SEL
1991 420 SEL with 560 motor
1993 Miata

Problem fixed. When my mechanic pulled out the thermostat he found that it was physically broken. The new one cured the problem... but after letting the car sit for over an hour he showed me the timing chain noise that it makes when started. I will be posting a question about that in the next few minutes.

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1988 420 SEL
1991 420 SEL with 560 motor
1993 Miata