2004 Chrysler 300M Questions

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Why when I am driving do I hear a random beep in my Chrysler 300 yet none of my dash lights come on with warning signs nor my check engine light so far have not recognized a pattern and wondering does anyone know what is going on?
my car will not crank or start but everything else works...checked battery, started, alternator and fuse
The battery was replaced and ever since then the car rarely starts immediately. I was told it was because taking the battery out set off some kind of anti theft system and all needed to do was hit unlock and lock on the fob. A month later I'm still having the same issue. Taking up to 45 minutes to start my car.
I have a subwoofer in a amp in for some reason my six by nines keep making this crackling sound and cutting in and out

My rpm jumps to 3000 and its like im stepping on the gas and the car idols reall hi
My cam gears line up with marks at the exhaust stroke. at end of intake stroke.marks face down. When I removed plugs all onpassengr side were clean and all on drivers side were black
it just came on while I was driving but when I turned the car off for about 15 min while in the store it did not start
My dealer says I have to buy a wiring harness yet in the car it is separate from the rest of the wiring although contained in common tubing. Used is not a good option!
I then use starting fluid and it usually starts right up but it sounds like a diesel when it first starts. It then will start normal for about a month and it then does it again. No check engine light comes on or anything and I always use middle grade gas and it is usually always chevron or shell.
Im getting a p0420 and 430 codes, should I try cleaning my oxygen sensors
the code was P0406 exhaust recirculation sensor A circuit high
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