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Certainly running on 4 or less. I would start with
1. Ignition leads, plugs
2. Injectors.
I would first look for cylinder specific items - that is same cylinders that are not working.
At this time NOT issues that effect all cylinders - coil - fuel - Motronic items - etc.
Where would I start - item 1 above - plugs first just cause it is simple and cheapest.
Examine all plug tips for further clues.
Paul
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