1997 Dodge Ram 1500 Questions

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I have been working on my truck. For almost a year now. I have changed out my spark plugs, spark plug wires, New distributor cap, New coil pack, changed out the crank sensor, changed out coolant temp sensor, and still no fire to to the motor. But the funny thing is when I put the code reader on it start right up, and when I unplugged the code reader it dies. What will be the problem, and how can I resolve it? Please any suggestions or answers PLEASE HELP ME
My engine light was on in my 1997 dodge ram 1500 v8 magnum, since I got it a month ago. I had several PO Codes and changed the O2 sensor and all I had left was 2 Solenoid codes. Tonight I checked fuses because my radio shuts as soon as I turn on the car and I saw that the fuel pump fuel (i believe) was missing and another was loose. I switched the 40A fuse from the trailer lights to the missing one and now the engine light is off and there are no PO Codes. Is this possible?? I feel like a fool for not checking this sooner but I am the furthest thing from a mechanic and just learning. I admit I love it and excited to learn more.
Thanks for your help.
I had the parking brake checked and it was fine. They ran it up on the rack and could not duplicate the noise. Took apart the pumpkin and looked at the fluid and for metal shavings, the fluid looked good and found no shavings. It doesn't make the sound all of the time, so I haven't been able to get anyone to look at it.
Does it need a new catalytic converter?
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