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I had a misfire issues on my van - cause was a TSB from Ford for their crappy bolts and seals that I had to pay for to get replace....yea me. So I shopped around for the info and the parts, and got a deal on $100 for parts for the swap, plus I spent for new wire, plugs, and while I was there, I put in a new ignition coil. So I was into this repair for close to $200....plus my labor (had to take the crap apart twice - upper intake out - 2 piece plastic deal. Anyways, I was ready to burn the van because of this issue....plus I found that one spark plug had almost come out on its own (as in less than one rotation of it and it came out)....and another one was really, really loose. So when I was done, it ran like a top.
So maybe you ought to run thru the basics on it - plugs, wires, maybe check the ignition coil/coil packs as well as check for vac leaks. These newer engines are a MOFO on vac leaks with all the emissions they have.
Good luck.
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