I was wondering about it, I don't seam to get that many more knock in the evening the blms do change from the morning. the truck has more by the seat of your pants power in the cooler air the mileage on my data log shows a little more in the cooler temp also. I think I need one of them [self adjusting out side temp controlers] for my in take air. maybe a little ac coil in my intake tube. I have an 91 pickup with a 747 ecm, do they have a iat option?
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