tuning 5.0 with moates quarter horse

notchback10s

New Member
Jan 22, 2010
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i have a built up 5.0 and i have been having problems getting it tune it seemed that i would get it running perfect and the next day i go to start her and it running like crap so i replaced my o2 sensor and fuel injectors! and i still runs like crap and is not firing in one cylinder i can tell by the spark plug and the way it runs! i had a guy make a tune for me and i not sure if its his tune or what but this is driving me crazy and advice would be great i at the point where i wanna rip my hair out
 
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