BMW 318ti Questions

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It want to start but it doesn't is it because I drove inside watery road it rained heavily and it showed me a sign of red battery on the dashboard I checked the engine everything is fine I think it might be petrol pump or maybe the alternator might have water inside as I was driving in heavily rained road
1999 BMW 318i issues that I hope you guys can give me an assist with:

1 In the morning, car tends to have some hesitation when the engine is cold.

2 When car stops completely and it is in D, and I have the foot on the brake, the engine (feels like engine) begins to shake. But when I take my foot off brake, shaking stops.

3 When I do stop the car, the RPM's dip and it feels like engine is about to stop, but then stabilizes, although the shaking begins.

4 Sometimes when I'm driving at higher speeds and apply the brake, RPM's rev up when they should be going down. Feels like when taking the car from 4th gear to 3rd and it still has too much speed. This is momentary and immediately RPM's begin to decrease.

Car runs great, transmission is not slipping, and engine feels like it is running fine.
I have changed the spark plugs, air filter, and exhaust sensors.

Any help would be greatly appreciated!
Many thanks in advance,
Nearly bought an MB, C230 'til I found out about the balance shaft issue. Benz is really dropping the ball, not stepping up for a recall. The fix is like $4000!
when car is running, everywhere, most of the time.
Went to move the car last night, put key in as usual, it turned to ignition, lights on and then nothing, the ignition is stuck on, the barrel is locked in place and if i wiggle it the barrel spins but doesn't start or turn off.
The car was working perfectly before and is usually really reliable, it is low mileage and hasn't been modified in any way that I know about, it may have an after market alarm.

Thanks in advance for any assistance.
i already have the entire head kit. i had my head checked it is 8 thousadths out and has to be shaved but the machinist told me once i shaved it i wuldnt have enough clearance left for my pistons to clear my valves how do i fix this
ive been told it might be the engine can I verify this
I had everything else fixed
this problem occurs when i reduce speed in traffic when its on drive.
as i was sitting still my car started spraying out antifreeze. i immed shut off car. the next day i started car and sadded water to see where leak was coming from. the car died,and now it wont start.
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