2000 Dodge Ram 1500 5.2l Bucking and Backfiring.....?

Hey, I am stumped as to how to get my truck back into good running order. Its a 2000
dodge ram 1500 5.2l 5 speed 4x4. I have done a lot of work to the truck including a
rebuilt of the top end of the engine, new clutch, brakes, etc......Last week I had to get it
towed home because it was not running right AT ALL. It would not fire and would jerk
you in your seat when it would fire, just bucking like crazy. If you would even attempt to
get up to speed, the second you let off the gas and got back on it, the whole truck
would just start throwing you around. It would also back fire, and the tachometer was
just going everywhere by itself, surging and dropping. Three codes are present at the
moment:

P0340: Cam sensor

P0141: 02 sensor

P01391: Crank/Cam sensor loos of signal


I have already replaced the crank sensor, that did nothing. And the 02 sensor code
came about about 3 months ago, but went away until just now.  Also, I should mention
that the truck idles PERFECT, but the second you touch the gas it gets all jumpy and
runs like garabage....I'm going to look into the cam sensor, but I am looking for some
expert input. I'm also curious if it could be the whole ECM and how to check
that.....Thanks.