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I had problem in my b20e before rebuild. The only way i could stop the miss was to open tappets untill it evened out,turned out front brg was badly worn with metal in sump. If your cam brgs are new they might have picked up if oilway is blocked or not lined up properly, or std brgs with -010 camshaft. It might not relate to your problem ,but you seem to have covered all other areas in your faultfinding. Opening valve lash .05 to .10" will instantly negate a fault if it is in this area. Regards Jack McIntyre.
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