Why would a 98 Dodge Dakota that is fuel injected with replaced plugs wires cap rotor the coil and the cam and crank sensors still be losing spark?

Answer 1

I believe that the cam sensor is an integral part of the distributor so I am assuming that you replaced that. I am also assuming that you purchased a NEW unit and not a REBUILT unit as you aren't a mechanic and know that you would not recognize a defective part. I also assume that by "losing spark" you mean that sometimes it has spark and that at other times it does not.

You may have a poor connection at an electrical connector. Check especially at the crank sensor and at the PCM.

You may have a dirty or bent crank sensor exciter wheel tooth (part of torque converter.)

You may have installed a defective new part. This happens. Also, with electronic parts, sometimes a cheapskate with tendencies toward acts of fraud will purchase a new part and return the old broken part to the retailer (dupe) as a new part for full refund which will then be resold to another unsuspecting motorist or mechanic who just might be you.

You might have a bit of corrosion at a fuse. Try wiggling each and every fuse one at a time while one assistant turns the key to crank the engine and another assistant watches the spark tester.