This is what the coil towers should look like.
A common reason for misfires, hesitation, and stumble is a corroded ignition coil and/or plug wire.
This example is from a 3.1 / 3.4 litre engine.
Burned / corroded coil tower
Burned / corroded plug wire
This can cause misfires under hard acceleration, or when cruising at a steady speed (45-65 mph) then accelerating to pass. Also will misfire at idle on wet, damp mornings. Causes a code p0300.
P0300 Engine Misfire Common Causes
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