Misfires under load (acceleration) can be caused by leaky spark plug boots. When a spark plug boot leaks, it allows the spark to arc, or jump, to the cylinder head. If evidence of arcing can be seen on the inside of the spark plug boot, new spark plug wires will be needed.
Misfires Under Load on Mazda 626
Average mileage: 133,754 (18,200–199,328)
Engines affected: 2.0L 4 Cylinder, 2.2L 4 Cylinder, 2.2L 4 Cylinder Turbo, 2.5L V6
21 people reported this problem
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Engine shutters under load plus very rough idle.