eto solusyon if i were in your position...

check if may hangin sa clutch and brake lines, if meron, bleed lang yan then refill. di pa ba sliding ang clutch mu?

change your platinum SP to stock, if andun pa din problem mo, check mu yung engine idling, kung mababa agad kahit kakastart mu pa lang ng makina(morning cold start), pacheck mo na sa mekaniko. i recommend NGK sparkplugs, it is the alternative SP for denso , and also used by toyota itself.imho bosch sucks! busina lang ok sa kanila

when ka huling nag change ng transimission oil? i assume na manual ka, so baka due na for pms ang gear oil mo.

and lastly, anung viscosity nilagay mu nung nagpachange oil ka? baka its too heavy kaya medyo hirap makina mo.

try to reset your ecu also, tanggal ka lang battery for `10mins. then start without revving it.