I live in Vegas and have been suffering with this issue every summer. I get a massive delay in throttle response at low RPMs when in hot conditions. First gear, foot to the ground and no power until 3k rpm and then it bursts into life - feels like really bad turbo lag. I have the Stillen Gen3 intakes and have wrapped them with gold tape heat insulation to try and keep the IAF sensor temps down. It seems to have helped, but has not cured the problem.
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