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IAT1 and IAT2 are both in the MAF.
On an LT1 - IAT1 is moved from the MAF to post SC to measure air temp.
On an LT4 - there is an additional temp - Manifold Temp - there are actually 2 manifold temps on the LT4, one is measured and one is calculated: only way I can determine the correct one to monitor is to log both with key ON (engine OFF) and disconnect the TMAP. the one that immediately goes to default temp is the correct one.
Hope that helps!
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