Question about 1986 Ford Bronco
A stick open (or defective) EGR valve is the most likely cause of this problem.
EGR valve let partly of the exhaust return to the intake system.
This valve is pull open by vacuum.
A vacuum leak or aged EGR valve will level the opening between exhaust to intake at an incorrect level.
Posted on Apr 24, 2010
Testimonial: "thanks i will have to smoke out my vacuum system to see if i have a leek "
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Posted on Jan 02, 2017
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