I am having a stumbling problem with my 87 Vanagon during warm up.
It runs ok for a few minutes until it is just getting up to operating temp
(needle approaching LED), and then it loses power and stumbles for a minute
or so, and then runs ok. This is in LA where the morning temps are 60 or
70 degrees.
        Does anyone have a clue about what to check out? It seems like a
problem during a transition in the operating phase.

thanks, gene kopan