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you have a serious electrical problem. It is related to the stereo. Disconnect the stereo and hard wire the stereo system directly to the battery with an inline fuse. My spidey senses tell me you are in a german/ european car? Major elevrtoical issues/ design.
See if resetting your ECC (ECM) called the computer will get rid of these problems. You do it by unhooking both battery cables, waiting at least 15 minutes and rehooking the battery. No security thing, only the fact the computer needs new settings for the parts you installed.
One thing to confirm is whether you have fuel in the car. If the engine immobiliser is engaged then you will have to check the battery in the key fob. If the car is an automatic then it is possible the car transmission is stuck in PARK. Starter motor could be a problem or simply the ignition is faulty. There are a lot of possibilities.
sounds like its not holding fuel pressure , I would check the fuel filter connections and that it was put on the correct way around, I would also look for fuel leaks around the injectors hope this helps.
This is ironic. I am on hear searching because the same thing happen to me today. replaced the battery and was having the smae idle issues. After a few hours of investigating and looking for air leaks we ended up with the intake into the throttle body housing loose and found alot of build up in the throttle body housing. Cleaned it out with carb spray and problem seems to have gone away for now. Not sure if this helps but this is where I am so far. Also check engine light was on and the tech erased it after cleaning and it has not come back on. Code was for mass air flow sensor and I originally tried a new one and it didn't change anything until I cleaned the carbon build up in the throttle body housing.