I have an issue when I start my 1984 Olds 98 Regency the first time each day. When it starts, it runs rough (it runs as if there's a little bit of water in the gas tank but I filled it up recently), to the point where it will stall if I don't apply pressure to the gas pedal within a minute or two. What's weird is that this issue only pops up on the first start each day, as everything runs great while driving. Successive starts after that rough first one are flawless too. Carb cleaner didn't really help.

I'm really wondering what could be causing this issue. My guess is the carb, but I'm not 100% sure as it runs great afterwards. Any input would be greatly appreciated.

 

Check the choke and especially the choke pulloff for correct operation

 

When was the last time the carb was rebuilt?

The CCC system works very well, but it MUST be adjusted exactly per the steps in the Chassis Service Manual. Also, every inch of the miles of vacuum hose under the hood must be in good shape and connected properly. Any minor crack in a hose that causes a leak will upset the system. I just went through this with the CCC carb in my wife's 1985 D88. Replaced all the vacuum hoses, rebuilt the carb, adjusted everything properly, and now it runs really well.

I'll also point out that the plastic float in the carb can deteriorate due to ethanol in today's gas, so replace it when rebuilding. Also, the bimetallic spring in the choke coil can get weak over time, so replacing that is also a good idea. The choke coil on these carbs is keyed to only allow it to go into the housing one way, so you cannot adjust it the way you could on older carbs.

 

It sounds to me that it may be a choke issue since you stated it only happens when the engine is "COLD".... Once the engine warms up, you said you no longer have a problem.....

 

Choke pull off probably needs opened up slightly. Pull the air cleaner, plug the vacuum lines and start it cold. Slowly adjust the pull off with a Phillips screw driver till it smooths out. If you go too much it will stall out when driving cold.