from experience in the auto repair industry, id have to be very skeptical that the iat temp would be causing this problem. but i have to say, ive never felt a car lose so much performance as it heats up. i mean, 5 minutes after starting up, the car feels like a whole 'nother beast, but after 10 minutes or so, the performance falls on its face, comparatively speaking. ive rarely had the problems you guys have had, but i can certainly attest to the performance falling as temps rise.
side note, i wonder if wiring the fans to run all the time would help lower the underhood temps. sure it isnt going to run at optimum fuel economy, but it may help a ton.
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