Rough idle, intermittent stumble and multiple codes

[russde]

Cleared similar codes (but not all at the same time) a month or so back, replaced the gas cap...so that part's done.
Drove fine this morning, early afternoon the idle was rough, a miss, but not horrible.
Later there was a definite stumble off idle with moderate throttle and then the lights on the dash lit up. I pulled the codes when I got home, P0172 and 0175 were active and
P0300, P0306, P0308, P0172, P0175, P0101 were all 'pending'.

What to check first?
TIA,
Russ

 

[NJGX]

Sounds like you may have a dirty mass airflow sensor. The pcm cant figure out the air volume flowing through the intake, so the engine will run rich to be safe and give you those confirmed codes. Start by getting some MAF cleaner and use the can on the sensor but don't touch it with anything. Replace your air filter if needed and check for buildup on your throttle body. If that doesn't fix your issue, it may be time to start replacing spark plugs, ignition coils, O2 sensors, or the MAF sensor itself.

 

[CO_Hunter]

Any chance you are using K/N or other oily type air filter?

 

[russde]

Stock type air filter...
I cleared the codes and they haven't returned. I'll clean the MAF this weekend and see what happens.
Thanks

 

[Rednexus]

I had MAF codes for a long time (intermittent) and it ended up being the connector between the MAF and the wiring harness. I had unplugged the MAF to install a cold air intake and a must have damaged the harness somehow. Endless cleaning of the MAF, replacement of the MAF, plugging and unplugging did not solve the issue. A $12 new connector/pigtail fixed it.

I will say that your codes are more symptomatic of a faulty MAF than a dirty MAF (unless it is really dirty). If you do replace the MAF a new OEM Hitachi MAF is around $60 on Amazon or Rock Auto and would be much cheaper than from the local auto parts store. I would also recommend getting a Bluetooth/Wifi OBDII code reader and using an app like Torque Pro to review actual sensor readings (like the MAF flowrate) and see if anything unusual pops up.

 

[russde]

Thanks