Re: Cold weather Idle problem
If it makes you feel any better, my 84 CJ7 with a Weber 32/36 on the 258 does the exact same thing - the only thing I could narrow it down to is the thermostat/cooling system. As the thermostat begins to open, the coolant starts flowing (from an almost stagnant state) and the water pump which was previously just thrashing coolant in its housing is now actually pumping coolant through a partially?? open thermostat - which requires more energy from the crankshaft until the water flow is consistent through the whole system and up to temperature for the thermostat to be fully open.
Or I could be off my rocker [img]images/graemlins/grin.gif[/img]
Seriously though, it also could be something in the EGR valve/vacuum system, several of the emissions controls open at specific coolant temperatures.
Again... I could be way way off here.