You need to take it to a repair shop and have it scanned for codes. That will tell you which cylinders are misfiring and the number of times. Then you can procede from there. Throwing parts at a problem is not a solution, it is expensive guess work. This is by far the best way to go.
Spark plug, wire, coil, low compression, fuel injector, intake leak, etc.
this could be the cause of a bad toque converter
There are a few things that can cause a low idle in a 2002 Chrysler Sebring. The fuel pump may not be working right, the fuel injectors could be old, or the car could be low on oil.
There are many places where new tires can be purchased for a Chrysler Sebring Convertible. Sears, Pepboys, Goodyear and Firestone companies all sell Chrysler Sebring Convertible tires.
Yes, it could be the cap along with, plugs, wires, injector, internal engine, water in the fuel, fuel pump,
Contaminated fuel could cause a misfire.
You have a leak in the cooling system. Could be water pump, hoses, radiator, headgasket, etc.
wheel barings
Wear indicators on brake pads
Insufficient stamina.
Depending on the cause of the misfire, it could damage the catalytic converter.
Chrysler Sebring is a great brand of car. Wiring diagrams are great use for mechanics. They could be found at local service dealers or auto parts stores.