are you sure that the mechanic set the timing up right[valve timing]?it is easy to make a mistake if you are not familiar with these engines and their quirks.drivers side cam sprocket has a timing washer that has the mark on it it has two keyway slots one top and one bottom if washer falls off and you didn't see it it can be put on upside down and will change the firing order on the left bank.call me if you need to.
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