Motor revs but vehicle does not accelerate: sounds
like a slipping clutch.

You coast along and it begins to engage: again,
possible slipping clutch.

HTH

> As I'm driving along sometimes the van seems to lose
>  power. The motor revs (but not too high) but won't
> accelerate. This is especially bad when I'm in the
> middle of an intersection.  Usually as I coast along
> it suddenly begins to engage again and off we go.
> What could be causing this?
>

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