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I had a stumble at this rpm and it turned out injector number 6 wasn't reinstalled correctly after i'd had a new valve cover put on. The injector was sitting too high in the port and leaking combustion. I only realised when i put a set of index 12's in and the cyl 6 injector was a bitch to remove as the port was carboned up. Once all the index 12's were in and coded that stumble has been gone
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