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I think I might be having the onset of a problem. I use torque to monitor the engine including the mixture. I noticed a couple of things lately, the mixture meter in the past has changed numbers too fast to follow but over the past few hundred miles, the numbers display long enough to actually see. The fuel mileage has jumped up 20% and in town the coolant temp is a little higher. Normal mileage is 20 highway and is now 24.

I"m thinking pump strainer, MAS or O2 sensor. No SEL as yet. Also, the car has always had a little constant sort of stumble at no boost light throttle which seems to be more pronounced.
 

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time for a boost/leak test and don't forget to rotate he throttle when listening for leaking shaft seals
 
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