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I guess it'd work... Maybe. Look, let's do a thought experiment:
Take some fuel and heat it up to 90 C, which would be about the temperature of your coolant on a warmed-up engine. Now, spray it into your intake manifold, which probably has air at around 35 C, on a good summer day. Keep in mind that there has to be a 14.7:1 air/fuel ratio by mass, that fuel has about a 2.22 kJ/(kg*K) heat of enthalpy, and that air has about a 1.01 kJ/(kg*K) heat of enthalpy. Do the basic heat capacity equations, and you will find that:
The resultant fuel/air mixture will have a final temperature of 42 C, and that's assuming complete and total vaporization of the fuel as it gets sprayed out of the fuel injectors.
You'd be better off heating up your air.
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