Backfire when accelerating on freeway

Joined
23 August 2004
Messages
78
Location
Georgia
I'm driving down the freeway at 60 mph and step on the throttle to pass. I hear a low noise backfire. No check engine light on.

Recently replaced plugs, air and fuel filter. Number one cylinder plug had some green corrosion on the connector end. Cleaned the plug connector with electric clean.

I have my suspicions, but any ideas on the cause this low noise back fire?
 
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