Case Study - 2002 Grand Cherokee Misfire P0340 P1391 P0351 P0352 - I Chase My Tail Round & Round

Diagnosing a misfire on a 2002 Jeep Grand Cherokee with the 4.0L.

Watch me chase several red herrings but eventually get it figured out.

P0340 P1391 P0351 P0352 DTCs.