every time my car is cold (it sleeps in the garage) its a ral pain in the *** on startup, cranks for a good 20 seconds, then spits & sputters rich, huffs black smoke then jumps to about 3k rpm, then as it slowly comes back down it gets to 1,000 sputters and dies, it does this untill it runs for about 5 minutes, any ideas? ive played with the fuel pressure & tried to adjust evrything i have to adjust but its exactly the same no matter what i do