sounds like a temp sensor problem there is no choke to richen up the mixture so the computer has to do that it relies on signals from sensors to know what conditions exist to make decisions one of these decision is cold start it will look at coolant temp and on some intake air temp. you need to scan the computer, on early ford sys you may need a break out box or hickock tester to get actual values some times you cant get good readings by back probing with d.v.o.m. try scaning for a code first ....ted