I checked and all of the vacuum hoses are connected and hold pressure/vacuum. I had some Honda top cylinder cleaner that was left over from another project on my CRV and introduced that per instructions through the intake line for the power brake booster per the instructions on the can. I don't know if that fixed the problem yet as the engine needs to cool completely and maybe the ambient temperature needs to drop a bit. It definitely smoothed things out with the valves though and made an improvement in the overall running of the vehicle. I recommend this to any vanagon driver as a can would cost about $2.75-$3.00. I have re-checked all connections and made sure that the plugs are not cross threaded and losing compression. I am wondering if some small bit of trash fell into a spark plug hole and caused some sort of issue. I frequently have found chipmunk/mice/squirrel bits of acorns and other food supplies where they sit on the engine and eat ( I live deep in the woods on a mountain). I will report back to the list on whether or not the problem is resolved. David Clarkson 1990 Westy (245k)
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