1995 Ram van no power intermittant(3.9)

Runs as though it is running out of gas.Usually feel a hesitation when accelerating lightly although it deteriorates to backfiring and stumbling .Sometimes seems to get better if the engine is turned off and restarted.Can
make accelerate smoother if you feather the throttle.If you hold it to the floor it runs fine.Always starts right up.changed fuel pump.Might run fine one day although seems to be running worse lately for longer periods.39 lbs fuel pressure doesnt vary.Injectors test at 14.6 ohms.The belly pan and intake I replaced, same problem.The cam position sensor is new and synced to +6.It stays unvarying in degrees.Throttle position sensor is new and adjusted correctly.The crank position sensor has been reading no signal on my tester Last couple of scans although the timing can be seen advancing.The injectors are opening for 2 milliseconds currently.The 02 sensor has been reading rich whether closed or open mode lately.The map sensor appears to be varying voltage correctly.The computer has been changed out to no avail.19 inches of vacuum at idle and steady.The problem continues whether egr is hooked up or bypassed.Temperature sensors are reading correctly.Before I throw more money at this,I was going to replace the map sensor first, the crank position sensor next, and then the 02 sensor(Same problem whether cold or hot).Any one have suggestions?
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Why do you have the cam sensor synched to +6?
Check for worn distributor bushings.
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They seem tight, although there is some up and down play.Ive been told that is a good position for the firing of the injectors.What would you suggest for sync?It doesnt seen to really make a difference although it seems to gain power when at +6.
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I had the same thing this fall on my 3.9. The pickup for the ignition is a know to fail or intermediatly fail. mine went at 79,000 miles. Drove home one night and it stumbled and backfired on the highway. When I got off the highway it just died. Then it took a few long cranking to catch again. I did have a fault code pop up for the sensor. Changed it the following day in 15 minutes was $70.00. Never happened again. This could be the same issue you have. Many have this happen but i lucked out it didnt completely fail out on the road. SCOTT
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Cam sensor synch is supposed to be zero. I think given that you get a weird read out on the crankshaft position sensor, you should investigate that area.
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