Hi all. Have been enjoying my new toy for the last two weeks until an emissions light came on last Friday under heavy acceleration. This light stayed on for a while, went off then stayed on permanently. It went back to the dealer who said they replaced spark plugs and the light was off. Until today that is! I accelerated heavily when the engine was just below 90 degrees on the temp chart and it cane back, flashing and juddering heavily as I accelerated. Eventually the light went off, juddering stopped and all was normal. Is it normal for the engine to behave this way when cold or is it time to go back the dealers again??