I have been living with an intermittant engine vibration problem (probably running on 3 cyl.) for a few years that dealer can't fix. The problem lasts for 30/45 secs. and disapears. the check engine light goes on and also disappears after a while untill the next time, maybe 2 days or 2 weeks. The wiring has been checked Ok. So far, I have renewed plugs, renewed injectors, renewed camshaft sensor, renewed crankshaft sensor, all at dealers suggestions but with no good results. I have studied this thing for a while but cannot figure it out. I am also looking for Subaru Canada email address without any success. If anyone wants to try solving please let me know, but requires a knowlegeable mechanic. Thanks meantime,
John