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Q:

what would cause idle to variate 5 to 800 rpms on 2000 Mazda 626

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
almost like a misfire ,but runs perfect on road,I just put in plugs and cleaned injection
(1) Answer
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There are several other possible causes. coil packs, low fuel pressure , intake vacume leaks. If you still can not find the issue give us a call.