Check your spark plugs. It could be that oil has leaked onto one or more of them (i.e. the small spark plug gaskets are installed incorrectly or leaking for some other reason). It could also be that that one or more of the spark plugs is/are "out of spec." (i.e. not gapped/gauged properly). It could even be something more simple like a coil pack that is not installed correctly.

Let us know how you get on. Good luck!

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2003 3.0i; Base Model Work Horse