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Old November 23rd, 2011, 07:09 PM   #123
Wheelin the HD
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They dont have to be "flashed for your vin" you have to do a "crank relearn" though aka "flash the computer". They have do it yourself instructions, but i hear its finicky and hard to do, the one from autozone is probably set to relearn when you start it up.
This could definitlly expkain your spark issue.
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