i hope the I.M.G gasket has been removed and a new one replaced. they dont have much holymer seal on them to compress when re used. when i did mine last i smeared the alloy surfaces each side with holymer to add a bit more sealing against leakage. it aso lets you position the gasket aligned in place to drop the manifold on to. with a leak and misfire it does point to the gasket . if so plugs 1 and 3 i believe should show signs of this. pain to revisit the job but at least you will know where you are.
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