Cylinder 2 on my car compression tested 0. i was thinking just a burnt piston or bad rings. especially since all my other cylinders comp tested 155 to 160 on all other 7. Appartently i got a bad tune... i bought it modded so my fault for not getting it retuned... i got a replacement piston but now that the block is scored im thinkning on a new block. Any ideas as to what i should do???