I own a 1998 Oldsmobile Intrigue equipped with the 3800 series II with about 120k - lately in the mornings when it is really cold 25-35 degrees the idle is erratic and looks and feels as if it is missing, driving is fine - then when stopped it seems to want to stall, coolant is good - oil is good. I am mechanically inclined and know my way around engines really well until all this computer stuff gets involved - please help before I figure out a way to shove an old carburated version in - LOL
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First you need to do is get the trouble code out of the computer this will get you in the right area of the problem then you can trouble shoot it.Sounds like it could be a EGR valve stuck in the open position.
COOLANT CHANGEON THE RADIATOR (LOWER DRIVERS SIDE FACING THE MOTOR) THERE IS A PLASTIC LIKE PLUG THAT YOU TURN COUNTER CLOCKWISE ABOUT 3/4 OF A TURN, THEN YOU CAN PULL IT OUT ABOUT 1/2 AN INCH THIS WILL DRAIN THE RADIATOR, THEN YOU CAN PUSH THE PLUG BACK IN AND TURN IT UNTIL YOU FEEL IT LOCK BACK IN PLACE. REFILL RADIATOR WITH 3 PARTS COOLANT TO 1 PART WATER. 1998-'99 Intrigues equipped with the 3800 engine have a specific process for replacing antifreeze. It is somewhat of a lengthy process and you should refer to your owners manual for doing this. After you empty and flush your system with water (garden hose), only fill the system with green 50/50 antifreeze, NOT Dex-Cool. Avoid Dex-Cool. If you bring your Intrigue to a shop to get serviced, make sure and inform whoever doing repairs and/or leave a note (clearly visible) to NOT use Dex-Cool if they're doing any work pertaining to cooling system.