[glenpointe]

I could feel misfire under the seat while idling at the traffic light (no codes or CEL), and after replaced the intake coupling, gaskets, spark plugs, vacuum hoses the misfire still there. It turned out, one of the ignition coils is weak and on its way out. However, I am not able to find a single ignition coil for 2005MY, and you have to buy as a set of four.

I believe 2006 thru 2011, the coil was redesigned. I'm wondering whether the 4-way mating connector is compatible? If yes, I just get a 2006 coil because they sell it as individually.

 

[Submariner409]

Some single coils here. https://www.rockauto.com/en/catalog...e,4.6l+v8,1430943,ignition,ignition+coil,7060

Dismount one and take it to a NAPA or other large (not Auto Zone) parts store and see what they have. You'll need to match the two different generations of coil exactly.

(UltraPower is an OEM supplier to GM. So is DELPHI)

(Who made the fuel pump in this AC Delco box ?????)

 

[glenpointe]

Rockauto and other places carry redesigned coils (horizontal connector; black Epoxy). The coil in my car has vertical connector and white epoxy.