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My H reg 1991 lwb petrol minibus is revving highly itself whilst driving it?

My H reg 1991 lwb petrol minibus is revving highly itself whilst driving it, and also it back fires loudly when i switch off the ignition, ive changed the filter,plugs oil etc. Whats causing it to back fire and how do i fix it?
Craig Gibson, November 2007
Sounds more like a fuelling problem than ignition,especially if it's causing the revs to hang. Check throttle for sticking and siezed linkages ect.

Tbird, November 2007