I have a 94 Chevy C1500 it has a cold start problem. Specs are 4.3 vortec v6,throtle body,ac, 2WD. The problem is that it seems to flood out when its cold. More when its cold out. When the exterior temp. is above 70 it starts much easier. After i crank it for a while it eventually starts.When it does start it blows out black smoke.I know there is a service bulliten about the fual pump pulsator, but i believe that would make it starve for gas untill it builds up pressure. I have had chevy test the electronics which all seems to read fine. I have changed: Fuel pump,fuel pump relay,fuel presure regulator,map sensor,throttle position sensor,oil pressure sending unit,temp sensor(for the computer),pick-up coil,idle air control valve,computer,cap,rotor,plugs,wires,air filter,and i have removed the throttle bottle to clean any carbon build up, which was very little.There are other parts that i cant remember off hand. :think: I am running out of options and money. At this rate i will probably need a new starter soon. If anyone knows my vehicles problem please help.I forgot to add it has 165k miles and gets a nice blue spark. I've also cleaned all the grounds. And made shure the timeing is set right and advancing properly which it is.Im still hunting for the problem.No check engine lights either.