Sludge build up on the throttle plate and/or idle air control valve can cause a poor engine idle, stalling, and/or hesitation – especially when the engine is still cold. The correction is to install a new idle air control valve spacer kit to prevent the sludge build up.
Car Problem Reports
Ford E-350 Poor Engine Idle, Stalling, Hesitation – Especially When Cold
Ford E-350 Problem
Engines Affected: 5.8L V8, 7.3L V8 Diesel
Average Mileage: 180,784 mi (160,000 mi - 201,569 mi)