2004 chrysler town country 2004 40000 miles

what are my options for po303 cylinder 3 misfire ,it stumbles sometimes

What does that mean?

A P0303 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.
Symptoms

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present Causes

A code P0303 may mean that one or more of the following has happened:

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Welcome to the forum. Don't know that this tells you any more that what Rickmn has told you but, it's a good reference source for code info:
http://www.obd-codes.com/trouble_codes/generic/p0303-cylinder-3-misfire-detected.php

Wendel,

I have the same vehicle, year, mileage...and now the same misfire code. What did you do to resolve the situation? Was it as simple as the spark plug? Or wires? Any advice on getting to the spark plug (3 is the back left - looks tricky)?

Thanks and I hope you were able to fix the problem.

Brian
bkelly8 @ tampabay.rr.com

Wendel,

I have the same vehicle, year, mileage...and now the same misfire code. What did you do to resolve the situation? Was it as simple as the spark plug? Or wires? Any advice on getting to the spark plug (3 is the back left - looks tricky)?

Thanks and I hope you were able to fix the problem.

Brian
bkelly8 @ tampabay.rr.com
I had the p0304 on our 2004 and it was as simple as a bad #4 sparkplug , just changed the one plug and that cured that , luckliy 4 is easy to get at right in the front . If its in the back then it is a pain .