We may never get an answer with only qualitative questioning, but we still got one more of the basics. How is the compression?
Probably all you need to know here is whether or not you have jumped a chain. Which gets to timing issues. You might need to verify cam timing and at the same time verify the ignition timing. The kind of timing I am worried about is not an adjustment. I am concerned that the chain could have jumped. This would show up with a compression test.
Bosch Master, ASE Master, L1
33 years MB technician