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Lost power / 97 Dakota

From : leon taylor

Q: my 97 dodge dakota recently just lost all of what little power it had . thinking it just needed a tune up i replaced the plugs wires dist cap and rotor and still no regain in performance . i recently replaced the 1st o2 sensor because i was getting 10 mpg and my fuel mileage returned to normal 19-22 hwy . i didnt replace the 2nd o2 sensor because the converter has been removed. it feels like the timing is retarded so i suspect the map sensor but it didnt show up when doing the code test . i also did a compression test that showed 150 lbs in each of the 6 cyl . thinking maybe a blown head gasket or burnt valve .i removed the iac valve and cleaned it no change . any help in this matter will be greatly appreciated ! .