hard starting 420 sel 87

Ok so I have been having trouble with my car not starting right up, it usually takes as least to tries, then it fires and runs great, warm starts are good, its just after it sets for a couple hours or overnight, everyone one said to start with the fuel accumulator so I replaced that it seemed to help the warm starts but when it sits overnight it is still hard to start, and the colder it gets here in Colorado the worse it seems to get, what should I try next? also my heater is less than great it seems like I am feeling cold air coming through some vents, any thoughts?