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Four.
Maybe when they put the spark plugs in they were not gapped right or they maybe the wrong spark plugs.
Every 60,000 miles.
Use the same Champion plugs the factory installed.
Tuning up a Chrysler PT Cruiser can be done at home or by a mechanic. A tune up will consist of an oil change, changing the spark plugs and wires, air filter, and distributor cap.
Four, one per cylinder.
Every 60,000-100,000 miles.
the spark plugs require a 5/8 inch spark plug socket.
Read the manual.
Changing spark plugs is an important task. To do this, disconnect the battery and spark plug cables, and remove the old spark plugs. Next put in the new spark plugs, and reconnect the spark plug cables and then the battery.
Spark plugs in a car need to be replaced every once in awhile. To replace them, disconnect the battery, disconnect the cables, remove the old spark plugs, replace with new spark plugs, reconnect the cables, and reconnect the cat battery.
Disconnect the battery, remove the spark plug cables and boot, and remove the old spark plugs. Put in the new spark plugs, attach the cables and boots, and connect the battery.