Engine temp and HP?

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RJ-92

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I have been having issues with my T-stat, I believe its stuck open cause my car takes forever to warm up adn doesn't get above 175*. No problem have a new one ready to go in. But I noticed with teh engine cool (<150* and possible in cold start mode, not sure) this thing just rips. ANd once it reaches normal operating temp it feels ALOT slower. Does this mean I am running lean under normal temp? I know it tends to run richer under cold temps. Guess I need to get to the dyno with O2 to know for sure. I wish my car always felt this strong as it does cold.

BTW, I don't usually drive it hard until everything reaches normal temp.
 

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