When engine gets cold after sitting a few hrs. it misses very bad when you first start it up until the engine gets warm. Will blow a lot of smoke out the exhaust just before it starts to run smooth. After that it runs good all day. 2003 F250 super duty with 6.0 diesel engine. problem started after a replacement key was used by my wife that was made at a local hardware store and not the dealer. Replacement key has no chip in it.
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