I recently changed out out two coil packs (2 & 3) and all the plugs in my 04 3.0 OHV. Gapped new Motorcraft plugs at .045. Now the engine sounds like it has an exhaust problem of some sort. I verified the reassembly of the EGR valve and cannot find anything unusual. Does anyone have any suggestions? Thank you
The only I problem I'm having now is sound related. It sounds like I need a new muffler. I cannot find any unconnected vacuum lines. I had heard there is a flexible tube that runs between the exhaust manifold and the catalytic converter. Maybe that's the issue.