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Having po 300 misfire code. Also had po 306 as well. Replaced #6 coil pack. Still getting po 300. Seems to run good but gets a little shaky at idle. I replaced all spark plugs. Noticed today a bit of white smoke at start up then went away? O2 sensor perhaps or a possible head gasket going? Any...

Checked wires on rear diff could not see anything wrong. Changed speed sensor and still no speedo. Could it be input or output sensor on tranny?? Help help help! Feel free to offer any advice. Dean.

My cruise will quit working and my speedometer becomes erratic? Is this the sensor on top of the rear end? Hard to change out? Thanks, Dean.