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I don't know why but when I read your post a "check the engine/body grounds" light went off in my head. If you don't have a good ground (check/clean battery cables at both ends and all body grounds) it might cause it to run like you describe.

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Q: How do you troubleshoot RPMs intermittently dropping on a 1992 Toyota 4Runner with auto transmission They sometimes go from 3500 to idle and once happened when the windshield wipers were switched on?
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