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Re: 97 5.7 vortec P0304
Ask your contact at the dealer to research Mechanical Sticking of the valves on the 5.7
My 98 has this problem. I think it is a result of the intake leak causing a gum up in the valve stems, just my opinion. I switched to Mobil 1 full syn oil, did a Seafoam treatment through the brake booster vac hose, and in the oil and fuel.
After about 2500 mikes the miss was and is still gone. Easier than rebuilding heads.
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