if i run anything in mine less than 91, the valves chatter like crazy. same thing with my old contour svt. since reading these threads i started using 87. no dif (well maybe 1 mpg (WAHOO!!) better). i am just running a pretty much bone stock 98 gt. any insight, people?
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98 GT - Usual
"Get in, sit down, shut up and HANG ON"
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