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2011 Mercury Grand Marquis Question: Detecting timing issues that could be causing rough idle and lack of power

 

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Texdan, Kerrville, TX, August 31, 2013, 08:49
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Ford dealer has replaced coils on 5,6&7 and eliminated fuel injectors. My past experience from the old days says the timing is off. The Ford analyzer says within specs. How can you determine timing issues?

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