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You were right to check the timing first, that's usually the culprit if the engine's fine at idle and has a problem at higher rpms. Did you check timing on both cams? Could have jumped time on one cam and not the other.
Is your check engine light on? If so, codes will tell you where to look.
Have you checked compression? Head gasket ok?
Do you know how old the fuel filter is? Or how old the gas in the tank is?
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