I can't understand this problem

Alrighty. I just got through putting in a new accelerator cable in this car. I don't have the old neon anymore. I have a 2001 dodge neon r/t now. Well get this guys, after i put the new cable in it, it revs by itself. It would make sputters and made the pedal really tough to push. After 2-3 annoying days of driving, it was slowly going back to normal, because it was idling unnaturally high. 1500 rpms +. Yesterday it was down to 1000 rpm idle but it was still too high cuz it usually idles at 600-800 rpms. I have a bad computer as well so I assumed that the computer was just having a hard time learning the new piece. Now here's where it gets fucked up. I'm going to the store to get some chips last night, I get in my car to go back to my friends house, turn the key, hear a click and that's it from the engine, all the power cuts and it's followed by a strange whining noise inside of the car. I disconnect the battery, wait a little, reconnect it, all the power's back on. Turn the key again, same outcome. I'm totally thrown off by this, I really have no idea wtf my car was doing, all I have is speculation. I go back to the engine bay and since I didn't have any tools but a screw driver, I go ahead to check the spark plug wires, pull them all, they have oil on them, and the cylinder thingys that incase the spark plugs all popped out except for one, which i think was cylinder 3. I take off my valve cover today to check for cracks, none, but I figured I would need a new gasket. So now I'm waiting for my cousin to come help me figure this out. If anyone may know if this is a general problem with r/ts I really need to know. I've never been caught off gaurd by a problem such as this, any suggestions or advice to assist me in fixing this would be greatly appreciated.

My Neon is a 97, so Im this is only a wild guess - as I had a similar problem with a another car. If there is a weak battery connection, or bad electrical connection between the battery and the important circuits on the car, the buzzer that is supposed to tell you something isnt right - wont make its usual noise. Instead of the usual beep - it made a weird squeak that continued. I banged on the battery terminals and wiggled the wires a bit, and the car started. In my case it was one of the ground cables running to the body, whose attaching bolt I had forgotten to tighten down.