There might be some carbon content inside your engine.. You can try
1) let ppl service it and get charged
2) floor your pedal for one week and see any effect, then only driving normally
I have tried my times on going slow eventually i change the gear on RPM 2K..
i don't floor the padel all the time. Careful driver lah.. ; ) unless i'm going up to genting lah..not really sure what happen.why my FC so high...*sigh*
Ken,
1) Consider changing fuel filter first.. Dunno it will works or not but heck, i believe the previous car owner never changed that
2) Use Shell V-power Racing a two full tanks. Try to clean the engine
3) Send to Hyundai for scanning
Dunno how much it will helps. It's just my opinions
Daniel,
I didn't. You want me to ask? You can simply call Mr. Lee at 012-2296855. Just say you from Hyundai Coupe Forum, Sim's friend. He should give you a good price. Anyway, I might be going to his place next Wed.