I would imagine leaving it ticking over for 20 mins would build up alot of heat. My guess is it would be fuel. I've noticed with mine if its tickingover for a while, when I do pull away and change from 1st to 2nd it pops nicely!.
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10 Years of Scoobies:04 WRX SL, 06 HAWK STI, 97 JDM WRX STI WAGON, 05 WRX STI, MK3 FOCUS RS, now Porsche Cayman S
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