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The orange light suggests and your engine is enviromently no running right this is usualy picked up by the oxygen sensor. An engine misfire when cold can be coolant temp sensor telling the ecu it is colder than it realy is causing over fueling, Spark will fail at the plug under cold conditions if the conection between the ciol and the plug is not sound look for carbon tracking down the porcilane on the plug.Trouble codes and engine spark/timming are not related, the ecu has no control over it. Ask your dealer to plug his diognostic tool into your car cheaper in the long run than just changing parts till you find a problem. Just rember this tool only checks ecu operated components no spark related.So it will check engine check light and trouble codes an point you in the direction but it cant tell you weather its say the coolant sensor or the wiring but thats where experiance and dealership back up save you time and money.
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