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Have a F150 4x4 with a 5.4 it is a 99 starts ok when it is cold run it till it gets warm and it has to turnover 10 to 15 times to start then it runs find what is worng:
That stuff is ok oil & fliter every 3000 5w30 all motorcraft just dont know how come it cranks so much when it is warm be for it starts then it runs good.
Do You Have A Check Enginge Light Coming On.? Of So Take It To Your Autopart Store To Run A Dio.. On It They Have A Scan To See If Any Code Are Coming Up..
Inspect if your timing chain is fine. The time I had a similar problem is when I filled some cheap fuel into my car recently. A dirty fuel injector could also usually be the culprit.