Here's a riddle for socially distanced problem solving.
My car runs great. Starts in 2 seconds, even at freezing temps. Settles into a fast idle that can be regulated nicely by the hand throttle with no issue. Accelerates hard and cruises perfectly. Downshifts nicely with throttle blipped heel and toe. All good.
On a 100 km drive to Bayfield, north of here yesterday, the car worked perfectly on the drive up, involving about a dozen rural stop signs and the overtaking of a few cars. Starting just fine at 2 degrees C. Sat at a friends house while we went for a long walk and coffees outside in the fall colours and to watch film crews set up for a major picture being filmed in the village. Four hours later, after dark, we left. Car started perfectly and ran fine through several small towns where we stopped at lights or stop signs. Pulled into town and into our neighbourhood and when I stopped to let a car go buy before pulling into our driveway, all I did was push the clutch in and the revs just dropped to zero. Restarted right away and I pulled into the driveway so my wife could get out and open the garage door. Revs dropped to zero as soon as I pushed the clutch in. Lights, heater fan etc. all kept running. Restarted again just fine. Pulled onto my lift. Pushed the clutch in and no issue. Idled at 875 rpm or so. Engine Temp about 170F and oil pressure fine. Voltmeter said 13.7 V for the whole drive, but drops to 12.7 at idle. Will go to 13.7 above 1000 rpm.
MFI speed switch works fine and I have had this happen both with the original Bosch speed transducer and with the modern solid state one (currently in the car). Throttle plate stops etc all perfect. Only thing different that what CMA would prescribe is that Robert set the car up to run at 2 degrees of advance instead of 5. Vacuum lines look ok though some of the cloth is frayed at the ends. On the list to replace.
This has occurred a couple of additional times in the past year, pre and post the engine being rebuilt. Always after a long cruising drive when coming up to a stop and pushing in the clutch.
Counting the 2 times last night, it would be 4-5 times in about 1700 miles of driving. Which is 4-5 times too many for me.
Suggestions? Vacuum advance hanging up or something?
Ravi
P.S. Gas tank always at 1/2 full or higher.