Having the stored diagnostic fault codes read is a good place to start.
The sensors you listed don't cause misfires. The Engine Computer adds extra fuel in cold temperatures so a high enough percentage vaporizes to burn properly. That's a product of the intake air temperature sensor. There's also a mass air flow sensor in the air intake. That tells the computer how much air, by weight, is going into the engine so the computer can command the correct corresponding amount of fuel. The oxygen sensors tell the computer how well the mixture burned. It's reporting on what already happened. It can't cause misfires either.
Tuesday, September 4th, 2012 AT 11:03 PM