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Old May 21st, 2007, 04:14 PM   #1
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1991 mustang lx 5.0
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spark knocking


i went to tennesee this weekend in my fox and i filled up to come home with mid grade 89 and it spark knocks like crazy when i get on it...how would i fix this
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Old May 21st, 2007, 06:34 PM   #2
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spark knocking


back the timing down maybe 10 degrees advanced. i run 15 degrees but i always use 93 octane
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