Hummer h3 feels really sluggish

[poweraidon]

I found out why it was running so sluggish... The dumbass previous owner didn't know how to change a spark plug and half of them were loose...


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[poweraidon]

It feels like a new truck now since I changed them


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[Airborne]

Nice glad you found out what the deal was!

 

[06 H3]

I haven't read all the other posts but during hard acceleration does it jump to redline quickly or do the rpms toes slowly?

 

[poweraidon]

I haven't read all the other posts but during hard acceleration does it jump to redline quickly or do the rpms toes slowly?

I guess it's kinda normal now with low end accleration it redlines kinda quick and the speed picks up at a moderate pace but when I hit 50mph rpm toes sloooowly... When I changed the spark plugs one of them was covered in this black grease and it was loose. What does it mean?


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