What's wrong? Lets walk through the process.
How fast does your themostatically controlled heater react? How big a heat reservoir does it have, including the surrounding metal? You take your foot off the gas, coasting down to a stop light. Your engine goes into DFCO. Fuel stagnates in the line and vaporizes. Seeing that a given volume of liquid expands TREMENDOUSLY in becoming a gas, fuel line pressure sky rockets and pushes fuel through the injector. DFCO no more. Additionally, if pre-vaporized fuel gets to the injector, you're likely to have a very bad detonation.
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"Jesus didn't bring 'Natty Lite' to the party. He brought the good stuff."
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