runs up and down when idling

Question by Edna Reward: Log in to view Status: Pending a resolution
2001 dodge truck when idling runs high and then low up and down



Reply from frappo_man User Rating:  160 Knowledge Tokens
Could be a fuel pump or fuel filter.
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Reply from zakoncrack User Rating:  0 Knowledge Tokens
Possibly the intake has a leak... the vaccume hoses can cause the car to change idle due to the change in air pressure in the intake and vaccume hoses
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Comment from Anonymous
1990 gmc 1/2 ton idle but will not open up new distributer


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