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My Code 71 problem was a clogged EGR VSV. Pull off your VSV and take a look at it. The metal pipes that connect the vacum lines running over the front/top of the engine can corrode on the inside and when the corrosion breaks loose it clogs the VSV. I could see the clogged VSV port when I removed my VSV.
If you search "Code 71" you'll find my story and others as well.
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1990 SR5 V6 Standard Cab Short Bed 4X4 5 Speed
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