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Rough Idle P300

   
Old May 24, 2025 | 12:04 PM
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donbrew
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Joined: 01-23-2009
Posts: 26,533
From: Fredericksburg,VA
The engine temp should never be below 179F after it warms up. If it is running 160F-170F the t-stat has failed! Replace wit ACDelco 131-158, no substitution allowed.
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