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Truck "bucking" in between 40-50 mph...

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Old December 30th, 2009, 7:43 PM
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Default Truck "bucking" in between 40-50 mph...
I just changed the spark plugs and gapped them to .055 and now I am noticing this when driving in the 40-50 mph range. Is the gap correct or could it be something else? It almost feels like a tranny slip but I don't think it was happening before I changed the plugs.

Thanks for any help in advance!
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Old December 30th, 2009, 9:14 PM
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What year is the truck? What size is the engine? What brand plugs did you use?
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Old December 31st, 2009, 9:23 AM
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Sorry 1996 Chevy Silverado 5.7 Vortec Z71 4x4 and cheap NGK G-Power Platinum plugs.
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