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whats wrong with my 2000 gmc safrai?

i just took a drive in this van again and its stating to buck a little now especially up hill
WILL MCCREARY, December 2005
Sounds like a secondary ingnition problem ,,,,plug breaking down or plug wire .....you didn`t mention how many miles it had but if over 30.000 it would be a good investment for replacement of plugs and wire set .......fuel filter also

bg, January 2006
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