96 Dodge 3500 Van - Intermittent Starting Problem

I have a 1996 Dodge 3500 Van, V-8. The van is in good shape, runs and starts and fine most of the time. However, occasionally the engine will turn over but not
attempt to fire regardless how long you try. The only solution is to let it sit, sometimes for days, but when its ready it starts almost instantly.
It doesn't matter if the engine is hot or cold. It will work perfectly for days, then the next time you try to start it, no go. I took it to a mechanic and it wouldn't start. They pushed it inside and suddenly it started and they were unable to make the problem occur again despite trying for a week.
Any suggestions?
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Check the break/clutch/transmission shift position sensor/switch.
Quick tap with a rubber mallet in the area of the switch/sensor when it won't state will likely tell you a lot.
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responding to http://www.motorsforum.com/dodge_trucks/96-dodge-3500-van-intermittent-starting-problem-48011-.htm , Mike Torpen wrote:
> > Check the break/clutch/transmission shift position sensor/switch. > > Quick tap with a rubber mallet in the area of the switch/sensor when it > > won't state will likely tell you a lot. > > > I should have mentioned it is an automatic, shifter on the column. Where would I look for the switch? On the column or on the transmission itself?
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http://www.motorsforum.com/dodge_trucks/96-dodge-3500-van-intermittent-starting-problem-48011-.htm
Not at all familiar with this specific vehicle so don't have a clue where the switch might be located.
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