1998 Ford Ranger

Engine Mechanical problem
1998 Ford Ranger 6 cyl Four Wheel Drive Automatic 176000 miles

I just did a compression test on all 6 cyclinders. As I understand it they should all be at about 150 psi. I got 125, 125, 150, 130, 140, and 140. It's interesting that I'm also getting a mis-fire on cylinder 3 which happens to be the only one that has good compression. What do I do?
April 6, 2010.

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