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Ford F250 truck stalling out

I have a 2001 Ford F250 truck – it was stalling out (which was diagnosed as a faulty fuel pump), so I had the dang thing replaced. But nearly 6 months later, it’s randomly stalling out again when I put it in reverse or stop at a light. Any thoughts?

I have a thought.

When the engine is hot, open the hood and with the engine idling, take the handle of a screwdriver and rap on the Idle Air Control valve.

If the idle speed changes, replace the IAC valve.