help 96 318is... midfiring

[sabbath130]

hello all, name is zack and havent been around in a while.
my 1996 318is m44 supercharged bmw has three check engine codes that i cannot fix. 1- random multiple misfire 2- cylinder two misfire 3- cylinder three misfire. on my boost gauge i am reading between 15-17.5 inches of helium at idle, believe a healthy engine SHOULD be approx 20.

i have taken multiple steps to try to fix the problem:
1- new coil pack
2- new spark plugs
3- new spark plug wires
4- new throttle position sensor
5- cleaned idle air speed control valve
6- checked for vacuum leaks.
7- replaced air injection hoses.
8- warm and cold compression test= never below 192 on ANY cylinder

sometimes when i go from in gear to rolling in neutral the rpm's will bounce before maintaining a steady idle speed. (the vacuum pressure bounces with the idle)

all in all... the car ran a 15.6 on the 1/4 mile (before a few of the fixes) and i spun all the way through first gear. car is drivable but definately holds back.
please help me becaue i am out of ideas.

[87esir]

check change all vacumn lines.
cam wear can cause vacumn changes and fluctuations.
are you running good plugs and fuel? When you boost you might be causing knocking which could trigger some of those codes.