5% run in? I havent heard of that. I think that could of possibly damaged your engine but im not sure. If its not that my friend had the same "symptons" on his touring car. It turned out his clutch had gone or "broke". After he replaced that it worked so you never know, have a look at it. Also, have you got a hot plug in your virus? i was going to get one and the hobby shop man (XD) told me it would need one so yeah that could help.