Hi all!
While cruising at constant speed of about 65, my 4.5 has hick-ups. As if there are misfirings. Happens also when I accelerate, but with no kickdown. Where to check first? Had the spark plugs out the other day and there was a bit of carbon(?-anyway it's black and you can scratch it off) residue on them. Car started up fine after that. Was a little rough before.
Thanks,
Fritz

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'73 280 SE 4.5
'94 Miata