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1998 Toyota 4Runner Question: engine seems to be runing rough while driving



trev115, 3.4L V6, Modesto, CA, February 02, 2011, 16:12

my toyota 4runner is running rough when i go 40 miles an hour or faster it feels like a bad sparke plug or wires. I replaced all those things and its still seems to be missing but it idles fine.

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