The Sebring is a Chrysler product. Replace the crankshaft position sensor before beginning any diagnosis.
you have 2of the plug wires on the wrong plugs or distributor cap
Possible failed valve cover gasket.Possible failed valve cover gasket.
Sensor failure, would have check engine light on. Excessive idle time. Aggressive driving. Poor maintenance, spark plugs, air filter, etc. Low tire pressure.
The spark plug tubes need replaced.
Possible bad valve seals. I have had this problem with my 1999 and that is what I was told.
Worn down piston rings will allow the oil to seep up into top chamber where the spark plugs are. Otherwise, you just have too much oil in your crankcase.
No
Possibly the crank sensor or the coil pack is dead. But with a dead crank sensor you also get no spark, no crank. No crank equals no fuel delivery.
The best place to find an engine diagram for a Chrysler Sebring would be in the owner's manual. If you do not have your, contact Chrysler or check your library.
In the "Chrysler Full-Size Models 1988-93 Automotive Repair Manual" says "Torque Specifications Ft-lbs Spark Plugs to set at "26"
the engine is constantly vibrating and it dislodges the spark plugs
It would be very expensive considering that car doesn't have a carburetor.