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2005 cadillac northstar misfire


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Wifes 2005 car with 29500 has misfire on start up.  Thought it was gas, new tank full, still misfires, but runs great after 8  to 10  miles of driving. 

shows 28  to 30  miles per gallon on gas. 

what could be causing this misfire on start up

SatchMax

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Does the Service Engine Soon light ( SES ) come on?

My first thought is spark plugs or coil pack. Pull the plugs and check them for dry black sooty deposits which indicates rich mixture or weak spark.

spark-plug-lean-rich-optimal.jpg

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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I have a 02 Deville that sits for an extended period of time . It misfires when Started and sometimes it's real bad. I have a lifter, valve lash adjuster the bleeds down causing the mis and runs smooth as glass after a couple minutes.

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