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Engine & DrivetrainEngines and Drivetrains can be a major problem for a lot of vehicles. If you are having engine or drivetrain problems, you can post your questions/concerns about the issue. Furthermore, if you are in the process of doing an engine rebuild, post your progress with pictures.
I have a 97 e150 van with the 4.7 engine. It runs good except when I try to give it more than 1/2 to 3/4 peddle. Then it starts to bog down. It actually picks up speed easier when I don't get my foot all the way in it than it does if I give it too much gas. I just had new plugs put in and they were no help. It's pulling an O2 sensor code(forgot which code) and some other code my tech says could be a vacuum leak. Today I accelerated slowly trying to eventually go to the floor and when I got past about half way it began to bog. Any ideas??
Thanks,
Dan
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4.7 engine acceleration problem 
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