David, based on your exhaust note and the pics of your plugs it looks like you are dropping #3. Check the #3 wire and #3 position on the cap. If you are running pertronix, you should swap in a different ring, or put your primary coil signal on a scope to make sure that all of the magnets in the pertronix rotor are healthy. With my most recently purchased pertronix I could not get the coupe to idle smoothly. I swapped in the ring from my bavaria and it idled perfectly. The attached pics show what I found when I put the suspect setup on the scope. The pronounced gap in the signal chain is a defective/missing magnet in the pertronix ring. I ended up ordering a replacement ring from Jegs for about $25. The defective ring now resides on my refrigerator.
deQuincy, your plugs meet the Colin Campbell definition of perfection: "light brown or greyish tan deposits on insulator nose."
deQuincy, your plugs meet the Colin Campbell definition of perfection: "light brown or greyish tan deposits on insulator nose."
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