Skip the auto shop - Our mechanics make house calls

Q: Truck won't run like it used to

asked by on

I just put a K&N air intake in my truck and it stalled and then there was a rough idle. Then when you give it gas it feels like it has half the power than it had and then it gets twice the power out of nowhere then the next day put the stock on and got the same problem. Got my scanner out and got some p0104, p3425, p3444, and p3449. Need help fast

My car has 90000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Believe it or not, this happens quite a bit when people swap OEM air filters to K&N or other products. It has nothing to do with the aftermarket part however. The P-0104 OBD-II error code along with the others you listed are directly related to the mass air flow sensor. If the sensor is damaged, or was unplugged during your K & N installation it will trigger all these error codes. Try looking at the mass air flow sensor to see if the sensor was unplugged, then try to reset the error codes and start again. If this doesn’t help, I suggest contacting a mechanic to give you a hand trying to diagnose your problems. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary 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. Truck won't run like it used to

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: Motor ticking and stalling

Initially, check the engine oil for correct level and smell it for a gas smell. If the engine oil level is low, add oil until it is correct. If it smells like gas, then you likely have another issue. Regardless,...

Q: Nothing happens when I push the gas pedal

The P0104 is probably the key. This is a code for the Mass Air Flow circuit. What it means is that the reading from the MAF is not along the lines of what the ECU expects. The 171 and 174...

Q: Car engine revs way up immediately upon starting engine.

Common causes of high RPM excursion at start-up are typically: large vacuum leak, throttle plate stuck open, cruise control stepper motor stuck in one position; faulty throttle position sensor, and/or faulty idle air control motor or solenoid. If you request...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...