Seafoam will help but be prepared to extract some broken plugs. Go ahead and buy the broke plug removal tool, especially if you have over 100k miles.
Do yourself a favor and pony up for the one piece plugs (champion) they are about $19 a piece.
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Proud owner of 93 Cobra #1928
306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards
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