I would do a compression check on the engine and make sure you are within specs on all cylinders... If all is good and the rest of the vehicle is mechanically sound, you should have no problem running tunes on it
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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