My RPM drops during shifting..

[flame00x]

Good day guys,
My ride is a KIA GTX 97. the problem occurs normally during shifting. parang namamatayan ako ng makina kasi bigla nagddrop ung RPM ko o kya umiilaw ung oil bigla normally when i shift from 1st to 2nd gear. sometimes it happens from 2nd to 3rd gear.
what i do na lng pag nakita ko n bigla nagdrop ung rpm while im shifting eh i just step up on the gas para di mamatay ang makina. ang kaso pag nagmenor na sya namamatay na ung engine. minsan inabutan ako sa highway, namatay ung engine and i had trouble starting. pagkstart, drop agad un RPM. after a minute bigla na naging ok. steady na ulit ung menor nya. san kya problema nun?
Dinala ko un sa Petron service, tune-up. they replaced 2 spark plugs which are already busted. i also asked kung ok pa ung carburetor, if it needs cleaning, sabi nila ok pa daw. Ok pa daw ang engine kxe very stable sya at di makalog. pero nangyayari pa din un problema na un. i also changed my high tension wires dahil nakakita ako ng spark nun isang bes n nagcheckup ako ng sasakyan. pro hindi ko naadress ung talagang problema. naitatakbo ko namn kya lang hassle ung bigla namamatayan ng engine sa daan. hope u could help me guys.
thanks.
God bless!

[theflaw]

Kung manual yan malamang stuck na release bearing.. Pinipigilan nya ikot ng makina pag apak sa clutch pedal..

[flame00x]

cge papacheck ko din sa mekaniko. thanks!