heres what i did today. i installed new spark plugs. the old ones were all BLACK. yuck. started the car back up, played with that black circular plastic thingy and the choke opened a little more (about half way). I also adjusted the carburator a bit since when I started it after the plug changed it was runnin rich (indicated by black smoke i believe). and it was backfiring at idle too! i adjusted the air fuel mixture a bit so it stopped but when i went down the street, i couldnt even lite em up it was boggin and ohhh mannnnn back firing. well supposedly my compression ratio is 9.2:1 what octane should i be runnin??
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1968 coupe
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