i have 1992 ford explorer when idling rpm is going up and down but while driving run great?

i have 1992 ford explorer when idling rpm is going up and down but while driving run great?

i have 1992 ford explorer when idling rpm is going up and down but while driving run great?

Posted: 18 Sep 2013 06:01 AM PDT

I already check for vaccum leaks change the o2 sensor and mass flow sensor all injectors are working need help what theory do you have

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