I have read all the archival correspondence regarding bogging, which has
become a problem for my '87 Westfalia. After about an hour at highway
speeds, it starts to lose power. This never happens below 50mph or on
country roads where the velocity changes frequently, no matter how long I've
been driving. The bogging can often be cured, albeit temporarily, by turning
off the engine and turning it on again.

Hoping to avoid costly replacement of the AFM, I am wondering what other
things (fuel system, wiring and exhaust system have been suggested in the
past) should be checked before springing for the new AFM and ground wire.

Thanks!

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