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I can not figure this out!! i have changed all 4 o2 sensors changed plugs and ran seafoam through it still getting codes and blowing blacksmoke really bad I'am lost
 

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blowing black smoke means either checking emission control equipment: ie PCV valve and EGR and then checking engine compression. One of those should reveal your problem.....
 

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have to get it on a scan tool............check fuel trims..........o2 voltages...........temp sensor voltages...........YOU have to see what the computer sees..........otherwise it's a very expensive guessing game........
 
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