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I recently degrease my wifes 1990 miata, and had the same trouble.

i found that being twin cam . the water had gotten down in to the spark plugs.

I first removed the plug leads, then blew out the water with compressed air.

then removed the plugs and wiped clean, with a rag down the spark plug holes, then finished with a clean of contact cleaner , then reassembles and yay no more splutter

.

so spark plugs were shorting cause it was all wet down in there ?

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14y ago
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Q: Why does my 1991 miata sputter after engine clean?
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