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95 EB Bronco, 5.8L
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88 Posts
Likely electrical, I would check for any bad grounds, corrosion on the connection pins etc. If those are all good and it's still buzzing, try swapping out the relay with a similar part# relay. Have you checked fuel pressure? Replaced fuel filter?
 

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Registered
95 EB Bronco, 5.8L
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88 Posts
I'm not sure about the your EFI setup on your 86, but on an old Ranger of mine, there was an identical relay in the control box. You might luck out and if yours is similar, you could try temporarily swapping them without having to buy a new one.
 
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