Skip the auto shop - Our mechanics make house calls

Q: Engine misfire - 2005 Chrysler 300

asked by on

The car is coding an engine misfire P0300 and P0303 and is physically chugging, has no power in 1st gear and literally feels like the car is going to shut down while in idle (chugs violently and the dash lights flicker, etc.). All the spark plugs and ignition coils are now new but this has not changed the misfiring or coding issues.

What would be the next step for an amateur DIY'er?

My car has 300000 miles.
My car has an automatic transmission.

A: Code P0300 relates to a random cylinder mis...

Code P0300 relates to a random cylinder misfiring which can be caused by many different issues such as the following:

I would recommend starting by checking for intake leaks as these are a common cause for this as well. Code P0303 relates specifically to cylinder #3 and can be caused by the same issues as mentioned above. This code may also be related to code P0300 as well.

If you would like to further assistance with this, a certified technician from YourMechanic can come to your location to diagnose the misfire firsthand so that the proper repair can be made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: The ignition in my car won't turn everything is locked up would I be able to replace the tumbler from one at the scrap yard ?

No you would not be able to use it since the keys are program keys. You will need to get a new one and then have it programmed to work with your car. You may be able to have another...

Q: Rough Idling

The first thing you will want to do is to have any fault codes read out of the engine computer. The check engine light coming on at times should indicate that fault codes were stored. These may just be from...

Q: Engine ticking and smoking.

It is possible that the ticking sound you are hearing could be an exhaust manifold leak. This would also explain the gas type smell inside the car. An engine this age may have some oil leaks as well which could...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...