about 140, try and find one used it should be cheaper

 

well, reseting the ECU was the first thing i tried, i did exactly as shown on instruction, after pulling the fuse, i let the car idle for awhile ( everything else turned off in the car), after a week of driving, nothing has improved, then i did the MAP Whack then repeat the process, then IAC valve, still the same
cleaning the oxygen sensor seems to be the next step ,
if i can just pin point the exactly the problem come from...
what concern me is: after driving for 5 min, the car is perfectly fine! (for the rest of the day, till next morning)

 

seams to happen only when the car is cold, check your coolant temperature sensors.

 

^^, how do i check it?

 

When was the last time you replaced your pcv valve (15$)? Poor idle is one of the primary symptoms of a bad pcv. It's also the cheapest to check first.

You can also just shake it, if it rattles it's usually fine.

 

It sounds like your IAC valve is bad. I know you cleaned it but that will not fix a IAC valve that is not working.

 

the car seems to behave better in a cool day...
arrr this drive me crazy, ok so i will need to check these:
1.pcv valve
2.oxygen sengor
3.IAC valve
4.MAP sensor
5 knock sensor
6 coolant cemp sensor

this wont be easy...

 

had the O2 sensor checked out today, it respond fine, so thats ruled out, i had my map sensor swapped with a friends cars, will try it tomorow morning to see...
wish me luck guys

 

When the IAC valve is cold, wax in the valve srinks thus bypassing enough air for a high idle when the engine is cold. Engine coolant will cause the wax to expand as the engine warms thus lowering the idle. Once the engine is fully warm the electrical part of the valve will control idle speed. If the electrical part of the IAC valve is bad then the engine will idle until the wax in the valve warms up.

 

if that is the case, should the car still have bad idle when the car is fully warm up?the car only stall in the beginning, after five minute of driving, the car drives normal!!. i have the pcv hose check today and it is fine, so that is ruled out as well