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My 4.0 starts fine, goes down drive fine, but when I hit highway it goes apxy 100 feet and acts like running out of gas. Then straightens up and runs perfectly until it sets for an hour or so then does same thing again. Showed code for position 2 oxygen sensor, so replaced and same thing.
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2001 with exact same issue. Installed new fuel pump, starts great, idles down, 1/4 mile later engines flutters and then shuts down as if out of fuel.
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