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'05 xlt v6

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    '05 XLT V6, P0303 & no compression -- head gasket? valve? piston?-- pls help diagnose (video)

    '05 XLT V6, ~85k. Truck was suffering from P0430 (Catalyst system efficiency below threshold (Bank 2)) and moderately uneven idle for few years, but yesterday -- peaceful local driving, stopped at intersection, when started moving (no noticeable "pop" or "clang" or whatever) -- engine shaking...
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