Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I'm unfamiliar with that engine, but a cold start misfire can be a sign of a failing head gasket.
How is the coolant level? Are you needing to top it off every so often?
I don't know if it's pheasable on this engine, but you could pull the #1 spark plugs in the morning before starting it up and look into the cylinder with a boroscope (or maybe just a flashlight) and look for wetness from coolant.
Also, a chemical test of the coolant system should reveal that particular failure should it be present.
