Q: 2007 Dodge Grand Caravan hard detonation problems

asked by on November 10, 2016

Caravan has hard detonation problems. Engine lacks power, cannot drive over 40 mph because starts to shake.OBD II Scanner detected engine misfire on cylinders 1, 3 (back) and 4 (front). So far have replaced sparks plugs (#4 was burned), spark plugs wires, ignition coil, knock sensor, TPS, Crankshaft Sensor and poured Cataclean into the tank. Two weeks later poured B-12 Chemtool (2 bottles), problem persists.

My car has 180000 miles.
My car has an automatic transmission.

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