I have a 2001 Ford Focus with 150,000 miles. I have replaced the fuel pump, fuel filter, spark plugs and wires, pvc valve, air filter, changed the oil, bought a new MAF sensor and the car still runs like crap. I had the check engine light code read at auto zone and it read; P0102 - - low voltage / low frequency to Mass Airflow Sensor. The car will idle and run normal about half the time. But the other half of the time I have to hold the brake with one foot and keep my other foot on the gas pedal just to keep it from stalling. Then when I go to take off at the light it will hesitate extremely bad for about 5-10 seconds before it will take off. Car runs and drives fine when out on the highway.
I don't know if this makes a difference but the cooling fan seems to kick on a lot (car does not overheat). Whenever the fan kicks on or A/C compressor is running the car runs worse. Any ideas???
try replaceing the idle air sensor it could be sending the wrong info to ur mass air flow sensor good luck hope this helps
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