a) brand new doesn't matter, you may have put a clamp on crooked
but since this is only when it's hot (by which i assume you mean up to temperature not overheating)
check the tsrm with a voltmeter and go thru the checks for your air flow meter
it is more than likely a worn/broken/shorting wire in your engine harness not in the afm itself if it does it with a good afm also
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Pics of my build.
"Good girls are just bad girls that don't get caught"
Do a diagnostic first!
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