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Why is truck wanting to die when idling in gear?

(1997 Ford F-150)
in Tolono, IL on August 01, 2015
Runs fantastic in park/neutral. Runs fantastic when on the gas. Wants to die when idling in gear, gets worse when truck is warmed up. Any Ideas. Truck sat for a couple years, I did put some sea foam in it and have ran out roughly 1/4 a tank of gas. Plan on running the tank empty and then putting some premium in w/fuel injector cleaner to hope this helps...but anyone got any ideas where to start if that doesn't work??
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Popular Answer
If you ideas do not work, I would also change the fuel filter and then check for vacuum leaks. If it sat for a while, I agree that fuel could be the issue. You may also have rodent damage to vacuum lines, damaged wires etc. Is there a check engine light? If all of these things don't help then checking for DTC's would be next. If you need any help with this St. Joseph Automotive & Diesel can check it out for you. 217-469-2018.
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