I just had my c4 rebuilt with a stage 2 shift kit, transmission cooler and 2000rpm hi stall. Anyway i got the car back about a month ago and have run it in for about 1000km's. Took it back to the mechanic today for him to check over it and it's all good. So i'm driving home from work pull up at a set of lights and decide to see how it goes. It went pretty good, but then i heard some loud grinding noise or like metal hitting against metal. Since i got my car back from being done, occasionally when i start it up there is this same noise. When driving normally it doesn't do it, only seems to be on start up and as i found out today hard acceleration. Any idea's what it might be? the starter motor?
Hopefully it's nothing too serious cause i'm starting to get frustrated with problem after problem lately.