2003 6.0l issue?
 

I just bought this truck a couple weeks ago.. I am having some type of issue, but I can't really get it pinned down. Here's the symptoms, and the ones I think that are tied into the same problem.

Truck just had fuel filters and oil change done. Used motorcraft filters and rotella t6.

When cold, truck feels like it's missing (if it was a gasser) when at idle. When driving, it's fine, but does the occasional miss when at idle until warm. Also, when I bought it, drove two hours, stopped to get diesel, when I went to start it it had a long crank, and then started. I know this points to HPOP, but I also have an oil leak, looking to come from upper and lower oil pan, but not sure.

Could this be the HPOP leaking, causing the miss, and the long start when hot?


Also on a side note, truck feels like it bumps when coming to a stop (directly after stopping) or when first getting on it, it feels like it's bumping.

If anyone has any idea, please lemme know. Tired of guessing.

First are you sure it is not over filled on oil?

Pretty sure, called for 15 quarts, that's what I put in there.