I have a 2000 stype 3.0 that idles rough and has an occasional loss of power. The codes p0301 and po351 have come up. I read all the posts regarding these codes and have replaced the elbow under the lower intake, the o rings in the intake, also upper and lower intake gaskets, the egr gasket, throttle body gasket, and a couple other vacuum hoses that looked bad. The problem still persists. If anyone can suggest anything I haven't done please help.

 

Swap or change its coil. If fault moves it's a bad coil. If it persists it's one of the other causes in the (free downloads) codes PDF / JTIS.

Check fuel trims to be sure there's no air leak.