Thread: 87 f250 vacuum leak at manifold 351w 4v
View Single Post
  #3  
Old 12-21-2005, 12:48 AM
Crasen Crasen is offline
AF Enthusiast
  
Join Date: Dec 2005
Posts: 154
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 87 f250 vacuum leak at manifold 351w 4v
have you tried cleaning out the EGR valve? If the EGR valve is stuck slightly open it can cause the engine to idle like it is a vacuum leak with a lean misfire when it is in fact a density misfire from the EGR valve allowing exhaust gas to enter the intake at idle.
Reply With Quote