Hi,
My 85 Caprice 305 sometimes idles too high at stop signs. Sometimes it will kick down, sometimes not. The problem is worse when the weather is cold. I've sprayed carb cleaner inside the carb and on all the linkages.
Once it warms up and I shut off the engine and restart, it idles normally, but once I drive it to the next stop sign, the high idle is back (sometimes, not always) and won't kick down.
I checked for voltage at ther wire going to the electric choke, and yes, it has voltage.
Could it be I need to drill out the rivets and replace the electric choke coil?
I had the hood up on a hot day with the hot engine idling high, and the thing would not kick down as I goosed the throttle repeatedly. But then I manually pushed down the brass colored tab on the passenger side of the carb one notch and the idle dropped, engine still ran fine, then I pushed it down again one more notch, and the idle dropped again, ensine ran fine. I've sprayed the heck out of the shaft going from the choke into the carb too.
Oh yeah, sometimes, not always, I get black smoke when starting it warm, and need to hold the pedal all the way down, and get a good long screech from a fan belt.
BTW the choke pull off valve is OK and working correctly. Already replaced it a few years ago.
Is there something else I have to clean off? Time for new electric choke coil?
Thanks