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

almost like a misfire ,but runs perfect on road,I just put in plugs and cleaned injection

by in Winston Salem, NC on December 28, 2011
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1 answer
ANSWER by , December 29, 2011
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.