this past spring my '06 was having a hesitation at 1000RPM/40mph, I had spark plugs replaced...problem solved...until this morning. Six months later the hesitation is back. Any ideas on what I need to look at for a fix. THANKS

 

I'd start by making sure all the plugs are torqued to spec. If the boots weren't replaced, replace them and clean the contacts on the COP'S.

 

I didn't replace the COP boots when I did my plugs. About a year later I was getting the miss again. I replaced the COP boots and springs like new again.

Rock Auto sells a set of 8 for under $30 shipped to you

 

^^^ This^^^

 

Did you use motorcraft plugs?

 

Yes I used Motorcraft plugs

 

We took my wife's Expedition in to get all the spark plugs replaced at 100,000 miles at the Ford Dealership. Later it started jumping when going slightly on an incline, or when you first started accelerating like the transmission was having trouble. We had it checked out and it wasn't the tranny, but the Ford mechanic forgot to change one of the spark-plugs! They replaced them all again and now it works great.