hi guys i was wondering if u can give me some advice on whats going on with my motor. well first of all i have a 1999 civic cx EJ6 with a d16y7 USDM motor. it drove fine when i first bought it from a private seller, but he sed 3rd gear grinds when driven hard. well now after two months, whenever i drive on the freeway, the rpm would rise and the speed would slowly rise, so after a few days, it got worse, the clutch would grab onto the gears but it would overrev which it felt like it was in neutral. and from what im thinkin the clutch is almost gone since its slipping. now the second problem there is a a knocking noise when im driving. and it seems like it coming from the block. and if im right it should be a broken piston or loose bearing of some sort... plz help me out ASAP! and tell me what are the cost if im right about the damages. if this is going to cost more than 1500 us dollars, then im swaping to a b18 jdm gsr engine