Hi everyone..I'm driving a 2004 Saga LMST.. There are alot of problem with my car..
My engine is not stable when idling..always jump from 0.6k to 1k..very annoying, the engine is shaking and it is not pleasant to drive..just change to a new 2nd hand carb..the problem still persist..my mechanic said 1-3 of the valve is spoilt..need to change it..how much will it cost? Is there any solution, can i use dcarbon insted?

One more thing, sometimes it is hard for me to engage to 1st gear..is it because of my synchro has worn out? How much will it cost to change the synchro?