Try the Shell service centre at Seksyen 5 which is next to the EPF building. The mechanic charges at reasonable prices. If you happen to go there try to ask for Hisham (017-3379447).
For general servicing and repairing , you might consider JC Auto @ at the other end of Hilton KFC there ... they are the Bridgestone Pro workshop and fast services as they got 5 men in that place
that day i was talking to aircond man .... he was saying something bout wiring the car making it to be more powerful for auto cars only ..... i wonder has anyone did this ? something bout adding relay ..... n he say...