2001 Ford F-150 used to stall when I put it in any gear and gave it gas, so starting small I replaced the fuel filter, no biggie. Now truck stalls when I put it in reverse. Ive heard of the inertia switch but never dealt with it could this be causing my problem or do I just need to pour in some fuel additive and hope and pray?
Not the inertia switch, they have to be manually reset, like a circuit breaker in your house.
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Engine
Mileage
Transmission
Drive System
Last time plugs were changed
Once rolling, how does it run.
If you have not changed the plugs, have a compression check, both dry and wet, performed when you do.
Is check engine light on? If so, what codes are you getting.
Expensive way to repair: Throw parts at it and hope to get lucky.
Cost effective way: Proper diagnosis.
Sure you can through some fuel system cleaner in it, you might get lucky.
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If no check engine light…I’d guess it is the idle air control valve…but that might change if I knew what engine you had.