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20v cold starts

My brother has 86 4kcsq and has rep[laced the engine with a 20v from a 1990
coupe quattro. All is in order except that the car refuses to start when the
temp is below 30f.
        All components are hooked up including NTC/G62 and throtle
potentiometer but the idle switch is not attached. could the idle switch be
what is affecting the cold starts. 

any help would be appriciated.

please email me as the list volume is hard to keep up with.