I have a 2008 Edge with the 3.5L Engine that has been misfiring. I just recently changed out all the coil packs, spark plugs and intake gasket. That seemed to work for about a week and then it started misfiing again. The engine light does not come on and a local garage nor a local dealership has been able to tell me what is the problem. They both have run diagnostics and scans.
The History:
The first time I had this checkd out by a local garage, they found one of the cylinders dropping off while I was driving it with the guy in the vehicle with me with a computer hooked up to it.. I changed that coil and it worked great for about a year. Then it started misfiring again. I again took it back to the same garage and they were unable to determine which cylinder was misfiring.
So I decided to give the dealer a shot and let them run a diagnostic on it. The only thing they could find was where I had left something unplugged where I had changed the plugs. So I put another set of plugs in it and that did not fix it.
DOES ANYONE HAVE ANY IDEA?
THANKS!