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The firing order for v6 is 165432
The driver side cylinder bank is numbered from front to rear-- 2-4-6
The passenger side cylinder bank is numbered from front to rear 1-3-5
The picture is for your coil pack, hopefully. So you can see how the coil towers are numbered.
My database for 09 showed coil on plug ignition. Is this the original engine?
I did see info for 07--3.7L that did appear to show a coil pack in tune-up manual.
If one of your ignition coils on the coil pack has gone out, that would affect two cylinders, and you would only have 4 cylinders still functioning. Those two cylinders would not have spark, well, actually a jolt of high voltage current, on the wires going to the spark plugs.
maybe it is the spark plugs or spark plug wires. or it is the distributor cap and rotor. the coil just provides the spark. but you can have it tested at a part store.
Number one and four are fired at the same time on a single wire from the PCM. Look for it to be intermittenly grounding somewhere along the route to the coil. You can wiggle the harness with the engine running to see if you can duplicate the miss. This will help to localize the area where you need to look closer. Look at areas where the harness crosses brackets or lays across areas like the transmission. Long term vibration can wear a small hole in the insulation causing intermittent problems on any circuit. I hope this helps.
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