runs fine then stalls out when slowing down or low speed

Asked by Apr 05, 2014 at 11:52 PM about the 1991 Ford F-150 XLT Lariat SB

Question type: Maintenance & Repair

replace plugs and wires

1 Answer

24,245

Most likely, the Throttle Body and IAC Solenoid (Idle Air Control) are dirty. You can remove both, clean them with carb spray and a cloth (no brushes). To properly reset the idle: Write down all of your radio stations, disconnect the battery for 5 minutes, run the engine at 2500 RPM for about 2 minutes and allow the engine to Idle for 2 minutes, then Idle in Drive for 2 minutes and then Idle in drive with the AC if equipped) and the Headlights on for 2 minutes. Shut it down for a minute and take it for a short drive. Idle quality should be much better.

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