I'm sure these kind of questions come a-dime-a-dozen, but I was hoping someone may have some insight as to starting/idling on my '95 County. Sometimes (though not all the time) on cold days/nights, I'll go to start her and it will fire, but it will start running as if it's on 6 or 7 cylinders. If I rev it up a bit (past 1000rpm) it will suddenly be fine for a minute, but if I let my foot off, the engine goes back down to idle speed and runs very rough, chuggy-like. It generally doesn't stall, but it has twice before. Of course, running rough when cold is nothing alien to a slightly old British automobile, but it's as if the computer isn't adjusting idle-speed for the cold temperature. If it's still cold and in park, the computer will rev the motor up and down in cycles (between 700-1500 rpm). Even after letting it run for a bit before setting off, it will idle at stop very rough, and I have to stab the throttle a bit to get it take off. After it fully warms to temp though, it has always ran completely fine.
Does any of this sound familiar to anyone? Is this just a characteristic of all 3.9's on cold startups, or is there some issue here?