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Random misfires checklist:
1. Check for leak in vacuum hoses. Some of them are under the I.M., and difficult to see/detect.
2. Cam Sensors (BMW brand only)
3. Crank Sensors (BMW brand only)
4. Coolant Temp Sensor, located near 5th and 6th cylinder area...
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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