1988 GMC C1500 Truck starts hard when cold

I have a 1988 Gmc Sierra with a 5.7 and TBI injection. When the truck is cold it is hard to start. When I turn the truck over it seems to load up with fuel. After about 5 minnutes of trying to start the truck I have to spray starting fluid in the throttle body and when I remove the air cleaner I can smell the fuel. Once the truck starts it misses and has no power to the truck warms up. I have changed the throttle body and coolant temp sensor, fuel pump, fuel filter, and many other parts. Any ideas would help me out greatley