All Focus owners with stalling issues and engine stops running while at intersections/stops.
Engine much louder than before?
Gas mileage getting worse?
Check your rubber boot (resonator) between the airbox and throttle body.
Remove it and inspect the underside for cracks and oil deteriorization of the boot. Ours did this and the boot had a 4" crack/opening in the bottom of it. This effects the airflow sensor and such system - replaced ours and runs like when we brought it home.
Mechanic shop completely missed this! They cost about $80-$90.
Hope this helps!
Sunday, July 9th, 2017 AT 2:31 PM