My '81 Syncro Westy starts fine, runs fine--with one problem.
If it has been up to normal temp, then sits for 20-60 minutes,
it will start again fine, but then in 10-20 seconds (just as I'm
trying to drive away) it will stumble and bog down.  It will
die, not idle.  It will restart OK.  If I drive "through" this
bogged-down period (10-15 seconds or less), then
suddenly, I can feel it break out and start to run perfectly.

I'm thinking a sensor is failing, but not sure which one.  Maybe
a temp sensor, or maybe the O2 sensor not heating up fast
enough?  Any ideas?

                                            Richard A. Jones
                                            Boulder, Colorado
                                            '81 Vanagon   Mr Bus
                                            '87 Syncro Westy   El Jefe