1988 420 SEL- Start up problems

[rodney1904]

1988 420 SEL-

No matter if it warm or cold outside. When I go to start the car, it take atleast 8 min's for the car to idle steady enough to drive the car. While I am giving the car gas at a steady RPM for about 5 min. If I let my foot off of the gas, it will die..

Even when the motor is up to TEMP, it still does this for 5 or so min's. It is very rough on the idle. However, when I drive the car it has a tad of a rough idle in gear but not near as bad. The car fires up great if I shut it off...run into the gas station or so ..but if i leave it sit for more than an hour--- It's back to square one ....

Does anyone have any clue what this could be ??