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My 1986 had the same problem. In Texas, we need emmissions test for licensing. Mine failed with 2000ppm. Mechanic said the leak in manifold caused the 02 sensor to send too much gas, and created the ppm issue. Got an estimate from mechanic for about $400.00. I found the part on e-bay or possibly Rockauto (good source), and replaced it myself. Ii is fairly simple, once you get room under the car. Do it yourself and save.
3dogsdad
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