Why does my truck start but not idle? It runs fine when i'm driving it though?

Its a 1996 ford f150 with a 4.9 liter inline 6 motor

My friend had this same problem. If i remember correctly it was his fuel filter. However different year, make, and model of a truck. I'm also by no means a professional, but thats what was wrong with my friends truck. Hopefully you will find and solve your problem!

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