if your car is still in warranty period then u better wish the block crack and piston ring spolit and etc etc so u can claim a new engine back. hehe... dont angry.
my car is 4 yrs old so i was really DAMM when i heard my block crack. the engine specialist told me that our 1.3 block is made in msia so u cant expect much. unless u use made in japan block. now i instal 4G15 block (recond), imported from japan. hehe.......
another way for u to solve ur engine is to overhaul it. dismantle it and check and re-assemble it back. but the cost is high. my fren is a mechanic so he can dismantle my engine for a very cheap charges.
anywhere good luck to ur engine.
oh ya. u try to fastern all ur 4 plugs. if any of the plug is loose ur power will drop.
buy a new air filter Rm10 only.
check ur plug see want to rosak or not?
and have ur engine ever kena overheat? if yes then please send ur engine head to check at engine shop. see the head got run out of shape or not. run out of shape cause the engine to loss compression then no power.