You may have to get a cam lift height measured, you may have a lode worn off the cam, valve springs can only be measured off the engine, start with the basic tune, a backfire will be a vacuum leak, a lean mixture or a faulty lead, are there any set codes? Do a scan not all codes set a MIL, start here.
Mark (mhpautos)
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Monday, December 13th, 2010 AT 9:50 PM