 Traction control light always on/dim ABS light
Hi All, I have a 1998 318ti sport, manual, DASC, lowered, with 4 17x8.5 (wide) contours. I am having a problem that is getting worse every month.
It started with the ASC light occasionally coming on last summer. It would happen after a few minuites of driving and go off after I power cycled the ignition. It went away about the time I put on my winter tires, so I figured it was related to the mix matched tires sizes I ran last summer. (fixed this summer)
This summer my airbag light came on and the code was for a seatbelt sensor that I have not fixed yet. Easy enough, but here is where it gets weird.
In the last few weeks, my airbag light started to dim. Fairly substantially. In some light conditions you can hardly tell if it is on. Then my ASC light started coming on, but far more often than last year and power cycling the ignition does not always help. Then the car started losing power as if the ASC was kicking in, and it shakes the whole car.
When I pulled the OBDII codes I got a 300, 301, 302, 303, 304. These are cylinder misfires. This seems to happen far more when the car is cold or under constant medium or heavy throttle. The boost stays consistent when this happens, so the ASC is not engaging the throttle plate thing under the hood. (although it feels like it)
Any ideas of where to start? | 
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