Replace the temp sensors that the ignition unit uses as well as the one for the engine ECU. Temperature related open circuit in the sensor makes the car think it is at a high or low temp. Mixture gets all screwed up. When the car warms up the sensor begin working properly and all is right with the world.

__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k