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Once engine warms up, I would have him disconnect that hidden coolant temp sensor Bosch connector in mid thermostat housing (not the one next to timing belt cover) and see if engine smooths out. If so sensor has to much resistance when hot.

Does he have a check engine light? Did he check for codes?

Also check connection to air flow meter and corragated hose for cracks.
 

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For a set of plugs the car sat for over 6 months?
 
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