I have a strange idling issue I could use some help with.
This is on my 68 400 auto car. The car ran like a top until last week. Took her out and when approaching a red light as I let my foot of the gas I could tell it will die on me. It didn't sound right all of a sudden.
The RPM at idle changed from about 700 to 500 or less. I kept my foot on the pedal to keep her running. I continued my drive for another 5 miles until I decided to head back home. It ran great once I was cruising but idle was rough and low.
I did most of the obvious so far, inspected the dizzy cap, checked timing, dwell, changed the points, plugs, checked the ignition coil. The carb was rebuilt a year ago so it should be fine still but haven't looked into it yet. All the plugs were tan, so good there.
