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I have a 2014 M8000 the other day it started popping and backfiring at higher rpms, I went through electrical test in service manual and found nothing wrong. checked all wiring and also tried a new stator and timing sensors, still did the same thing. How do these systems work with 4 ignition coils? can I switch them around to see if one is failing? Any help would be appreciated!!! hope to hear some good feedback!! Thanks in advance