Originally Posted by alloro

Did this start happening after it got cold out side? If so the spark plug gap could be too large or the CTS could be bad. A larger gap requires more energy to jump and cold air being more dense also requires more energy to jump the gap. A bad CTS will make the PCM think the engine is warm and will not richen the mixture for a cold start. That's the equivalent of the choke not closing on a carbureted engine. Starting fluid burns easier than gas so it is able to fire until the engine produces a bit of heat in the cylinders.