No engine cold start if the car sits for 7 hours?

If the car sits for 7 hours it has to have help via a small shot of brake clean in the intake to get it fired off, until it reaches operating temperature there is a noticeable power reduction while driving. Once the temperature hits that goes away and it runs fine. Once warmed up restarts are no issue, only after a 7-hour cool does the problem resurface. I noticed that when I run my cold start procedure every morning I let the car idle until it reaches temperature, I know when it reaches temperature not by the temperature gauge, but by a 2 second long array of misfire that almost stalls the engine, then it catches up , clears up instantly and no problems again until a 7 hour cool. Any ideas?