I took a little time today to pop the valve cover and look for any broken valve springs. Everything looks good. I was suspicious of the plug wire, changed that wire. No real change, still flutters at idle. Next is a compression test, and I want to move the injector from that cylinder to another to see if the miss follows it.
It's tucked away in the garage for now.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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