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Thanks for your help Joegr. I'll be taking it in to run diagnostics and see if it is the pcm afterall

Spliced in a new set of cables and connector on cylinder 6. Replaced the plug and coil at the same time. The problem is still there. Is all that's left the pcm? I know that there are currently none in stock in the USA

If it happens to be damaged wiring, is it possible to replace the harness that connects the coils together? Or is a complete wiring harness that is needed?

Replacing the coil and plug fixed the issue temporarily. I've been about 350 miles and the problem has already resurfaced. Is there another cause for this code or do I just have back to back defective coils?

That's a good point that I hadn't even considered. Makes perfect sense that they could easily affect one another. Is there any benefit on these cars between platinum and regular plugs? I only ask because I had a truck that if platinum were used it would run too hot and short out

They're motorcraft coils. I did not do the spark plugs as they had been replaced shortly before I purchased the car. It had 103k on it at the time. Probably worth checking out again at this point

I replaced the complete set or coils about 20k miles ago. What cylinder does #6 refer to?

I've got a 2004 LS V8 with 158k, today it started running rough at low rpm and eventually gave an MIL. I noticed at this point it seemed to be skipping a gear so I put it into sport mode and found that the car will not go into 3rd gear. It skips right over it from 2nd to 4th. The code stores...