it just started running bad vibrating like running on a couple cylinders it's never done it before

What is your question?

I was driving yesterday and stoped at store pulled off it started vibrating sounds like it's only running on a couple cylinders it's never done it before

What makes this problem better or worse?

it's a v6 4.2 2001 ford f-150

How long has your 2001 Ford F-150 had this problem?

just started