sir, na experience ko yan sa una kong esi. i have a few things that you may need to check :

1. fuel pump, possible n baka my build up ka dun. kaya sinisinok sya. (to ngpasakit ng ulo ko sa 6g galant nmin dati)

2. intake and throttle body, lalo n yng servo, (this happened with my 2nd esi na) replaced the servo and

3. alternator, yng s'kin kse nadamay to nung ngloko yng servo

4. engine block- bka patay o may leak yng isang cylinder which causes loss of compression, hopefully hindi ito sakit ng oto mo pro u can check. pg bumababa din idle mo pg nililiko steering wheel, mrn kng leak. (nangyari to sa unang esi ko, ngpalit ako piston rings ok na pro eventually ngpalit n din ako ng block kse may crack pla yng isang cylinder, sbi ng mekaniko pwede dw cylinder sleeve pro i decided to have it replaced n lng)

which side nga pla galing yng whistling sound? pg driver side it may just be the alternator working overtime dahil yng clicking is from the compressor mo which will turn on more frequently pra masustain nya yng minimal temperature ng aircon mo.

hindi mo sya mraramdaman pg patay aircon kse wlang additional load ng compressor sa makina.

sna mkatulong po to sir