If you really want to tune an engine right, invest the money in a wide band oxygen sensor. You'll need to put an oxygen sensor bung in the exhaust pipe a few inches below the manifold. Install the sensor and portable output unit and you can drive down the road and record several minutes of readings which convert to air/fuel ration. You remove the oxygen sensor itself when you're through testing and plug the bung. But it's there for the next time if you need to use it. Joe
