Maybe when they put the spark plugs in they were not gapped right or they maybe the wrong spark plugs.
Four.
Every 60,000 miles.
Use the same Champion plugs the factory installed.
Four, one per cylinder.
Every 60,000-100,000 miles.
the spark plugs require a 5/8 inch spark plug socket.
Could be spark plugs, spark plug wires or the cell pack. I've had the same problem with my 2005 PT Cruiser and it was the plugs that needed changing.
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.
My Chrysler 300 SRT8 with a 5.7 Hemi has 16 spark plugs
the transmition ,is probably not adjusted to the spark plugs,or their not the right spark plugs
Causes of a misfire include spark plugs, coils, fuel injector, wiring, computer, or internal engine problems.
Champion