Hello Everyone!

I'm looking for some insight, my 1998 volvo s70(base) with 100k miles, is stalling. It always happens when i'm driving(never when i'm stopped) and always at low speeds(turning right or left), it idles fine.

the first time, my mechanic found a loose vacum hose. the second trip to the mechanic resulted in the maf and throttle body cleaning after it was showing code p0171 and a new fuel filter.

I'm at a loss as to what to do next, do i replace the maf sensor, the o2 sensor, or fuel pump? the last time it stalled there was no check engine light and it seems to happen after about 20-30 mins of driving.

Thanks for taking the time....Dennis