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Q: Truck is dying when in drive. 1999 Ford F-150

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I have a 99 Ford f150 with the 4.6. Here lately it has been rough idling and will die at a red light. I have replaced the EGR valve and mass air flow sensor. I don't know what else to do. I need help this is my only ride.

My car has 166000 miles.
My car has an automatic transmission.

Hello. If this issue it only occurring at idle, then it is either due to a vacuum leak in the engine or more commonly a failing idle air control valve. This is a common failure on this vehicle.

I usually start by checking the computer for any codes and then I monitor the sensor signals just to make sure nothing is abnormal. If everything is fine then I do a smoke test of the intake system to check for vacuum leaks. If this is okay, then I clean the throttle body and replace the idle control valve. If you are thinking of having your idling issue repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the stalling issue and moving forward with repair.

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