1998 2.2 imprezna engine in vw baha convert. looses cylinders. turn key off then back on runs great any ideas?.

Earth straps. Lots of good earth straps from engine to chassis.

found my problem hit a bump the knock sensor says oops cut the wire no more problem. am going to megasquirt any body have input on which one and what do you do with the egr keep it or throw it.