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

Asked by for the 2000 Mazda 626
1 answer
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.