Skip the auto shop - Our mechanics make house calls

Q: Nissan Altima 06 rps go up and down and now it shuts down while driving.

asked by on

Hello, well everything started when i performed a tune up, i clean the throttle body with a special cleaner, everything was fine until i decided to disconnect the connections to remove it and clean it better, after that put it back just the way it was and rps started to go up and down. i drove the car like that since it was still running, but now i notice that the engine sounds week like a super old car it makes noises like is about to shut down, and well eventually it does if i'm driving and make a hard stop the car would shut down, sometimes i have to attempted to start multiple times until it starts. currently im using uber and will be taking my car to a mechanic which i dont trust but i have no other option, i wonder if any of you guy might have any ideas. i use my code reader and shows P0300 i already replace 2 or 3 coils spark plugs were changed few months ago like September or so oil keep going quick, car runs btw if i dont press the accelerator the car kind of slows down. ty al

My car has 210000 miles.
My car has an automatic transmission.

Hi there. It looks as if your Nissan is experiencing a random misfire issue; as this is what the P-0300 OBD-II trouble code typically indicates. If more than one cylinder misfires, this will increase or decrease the revolutions per minute (RPM) of the crankshaft. If that increase and/or decrease is more than 2 percent, the Powertrain Control Module will store the P0300 trouble code. This could be caused by one of the wires you disconnected; possible to a fuel injector or other component. I would recommend having one of our mobile mechanics come to your location and complete an engine is misfiring inspection first, before completing or attempting any repairs. This could be a very simple solution or something larger; so it might be best to get another pair of experienced hands to help out.

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!
  • Home
  • Questions
  • Nissan Altima 06 rps go up and down and now it shuts down while driving.

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: hello i have a nissan np2oo bakkie. recently my temperature guage keeps goin up and down> 2013 Nissan NP200

Hello - there are several possible cooling system problems which could cause this behavior, low coolant level, a thermostat that is failing - not holding constant temperature, a cooling system that has degraded, and cannot keep up with short-term "extra...

Q: Brake pedal has too much play.

Brake issues are always a big concern for any driver. I am going to assume from the description provided that both the front and rear brakes were replaced on your vehicle. If, despite these new parts, you are still experiencing...

Q: Air conditioner doesn't blow cold air

Hi. I would first recommend checking the refrigerant levels. Improper refrigerant levels is the number one cause for malfunctioning air conditioners. I suggest having the pressures checked at the high side and low side of the system. Seeing what the...

Related articles

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.