How can I fix my 87 dodge ram day van?

My dodge ram day van sometimes stalls when my foot is not on the excelerator.
When slowing down or changing from neutral to drive or reverse. When stationary it will tick over fine for a few minutes and then it just cuts out.
Sometimes it will last for ages working fine and then it might stall two or three times in ten minutes.. any ideas?
Mat foster, May 2012


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