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Discussion Starter #1
I have a 99 f350 with 7.3 I installed the bully dog GT tuner last week, intsall was easy but since then and about 150 miles when i have the truck in park and rpms at 2000 they will drop on its own around 400 rpms. Power seems fine gass mil. is good but it seems to have a engine slight engine knock now. Any help or suggestions would be great.Thanks
 

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ADMIN/MAFIA
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Try running it on with out the tuner and see what happens.
 

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Discussion Starter #3 (Edited)
I did remove tuner, no change. The mechanic said possibly air in the line. I havent heard back yet. I like the tuner, it uped my mpg to 26 on tow mode and plenty of power.
 

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This is a 7.3l and getting 26mpg? Im guessing this is not hand calced? I would first changr fuel filter then see what happens.
 
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