Skip the auto shop - Our mechanics make house calls

Q: Multiple misfire codes and hard shifting

asked by on

I am at a loss.. I recently bought a used 2002 durango 4.7. On driving it home, of course i punched it. The motor immediately seemed to "bog" out, the rpms went nuts, and the truck violently shudders. I went by autozone to check the code, came back a p0351, and p0301. Sp i bought an ignition coil and plug. When i took the old plug out, it was visibly damaged, the side looked like it had broken out. So i replaced the plug and coil. Reset the codes, immediately the p0351 came back on. Its really hard to describe, but the engine makes a really loud sucking sound on acceleration. If gently accelerating, it will crawl through gears. But if i accelerate hard, the rpms goes nuts, the whole truck shudders. Now, if i release the gas, and press it again, i can "manually" shift it....im sure the code and shifting issues are seperate, but i dont know enough about either....ive changed the coil and plug, and honestly cant afford a mechanic. As of right now, i have a 0456,0300, 0301, and 0351 code.

My car has 240000 miles.
My car has an automatic transmission.

Hello. I would start by doing a compression test. From the codes you are getting to the way that is is running and the sound that you hear it sounds like you have a failed valve seat. When this occurs the valve will not close properly and the seat may be inside of the engine damaging the piston. This is very common. If the compression test comes back fine, then there may be an electrical issue with one of the grounds. If you need to have this looked at in person, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the codes and move forward with the proper repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Multiple misfire codes and hard shifting

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car won't start and the word fuse is lighting up on my cluster. What does it mean?

Hi there. The fuse light will come on if the engine is not starting up for more than 15 seconds. This is a fail safe light that warns the driver that the starting circuit has a fault and needs attention....

Q: Misfire on cylinder 8

It could be the spark plug, ignition coil, or coil boot causing the misfire. You may also have dirty fuel injectors that need to be cleaned. Have the ECM scanned to see if the misfire code is P0308. This code...

Q: Our 2000 dodge durango tries to turn over, but won't start. We already replaced coils and spark plugs

The blinker malfunction is probably a coincidence. High fuel consumption could be related to the no start issue, particularly if faulty engine management controls, or sensors, are at issue. Basically, inasmuch as the car will just flat out not start...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.