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- - 4.2 Stumbles (https://www.ford-trucks.com/forums/626322-4-2-stumbles.html)

Braker 19

06-25-2007 08:25 PM

4.2 Stumbles

When I take off from a dead stop the motor stumbles or hesitates. It dosen't do it all of the time, but, most of the time. Seems like it takes it second to get going. I have changed plugs, wires, fuel filter, and used fuel injector cleaner. No luck. When I have under a quarter of a tank it does it less. I'm stumped.

ATC Crazy

06-26-2007 01:06 PM

It's most likely the IAC (Idle air control) valve. Im having the same problem with my 4.6L...but Im not ready to lay down $60 for the valve yet..

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