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98 running really rough


owen11105
11-18-2007, 03:04 PM
98 4.3 liter running very rough. replaced fuel pump, broke tank vent; replaced broken tank vent. replaced spark plugs. blows a lot of hydrocarbons and unburned fuel. seems like its choking itself out. could it possibly be an oxygen sensor?

MT-2500
11-18-2007, 05:49 PM
What is the fuel pressure now?
Any codes or check engine lights?
Any missfire?
How is the egr valve?

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