I have noticed that I still have a bit of a problem w/ #8 cylinder firing. It misses when cold and seams to run fine when the engine is warmed up. I did have a problem w/ that cylender firing in the past but it improved when I put in an older autolite spark plug to replace a new Bosh platinum plug that did not seem to fire on that cylender. I have run it (only in the garage as car not on the road) for about 6 months of weekly starts and 1/2 hour time at idle w/ some revs. Here is a pic of that plug.

For any history on the problem in that cylender I refer you to this post
https://board.moparts.org/ubbthreads/show...&PHPSESSID=


BTW, You can't tell from the pic but the plug is wet and smells like gas even though last I had it running was about 1-2 days ago.

2nd pic just in case

Thats oil

you need new ones

Looks like oil, what kind valve seals are you running?

I don't know about the valve seals. had the car since 1991 but never had it on the road.

Borrow a bore scope from someone and see if you can look at the backside of the intake valve. Usually can be done if you remove the carb and run down the intake. If its oily you have a bad valve seal and thats what youre looking at. The gas smell is from the plug not firing and is common. I think Id run a compression check first just to make sure this cyl compression is in line with the other cyl's to rule out a ring.

have you pulled the valve cover to insure the valve train is ok? Could be a non opening intake valve.

Also make sure the PCV system is all good, a good test is while its idleing, pull the PCV valve out of the VC & put your finger over it, the RPMs should drop & you'll feel a strong suction, if you don't, you need to fix it if its blocked somewhere, if its not, a weak signal here indicates weak rings. It is also very possible its the seals are gone & the guides are badly worn.

I didnt get back to that thread but if you swapped wires and plugs and it looks like that and still misses, you more than likely have a mechanical problem in that cylinder. Do a compression test on the engine and report the findings. If it was me at this point, I'd be pulling the head just to see what's going on.