There is no carburetor on these cars , the idle air control valve is an easy thing to change it is on the passenger side near the firewall on the back of the engine buy the new one so you know what it looks like it has a wire connector on top 2 bolts and a gasket behind it just unhook it unbolt it remove the old gasket install the new one with the new gasket and plug it in simple there is no sealer required
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first relief fuel pressure before disconnecting fuel lines remove fuel pump fuse or relay start engine let it idle until stall out lack fuel fuel now fuel pressure is reliefed. you have to remove top upper air cleaner housing, you have to remove whole entire air cleaning system because the fuel lines with fuel injectors is under the air cleaner filament you have to remove entire fuel line with fuel injector in order to replace fuel injector.
Note: Only a high pressure service valve is used for A/C system servicing. A low pressure service valve is not installed. Perform all A/C system service (ie. discharging, evacuating and charging) through the high pressure service valve only.
1. When idle, listen to the engine and see if there is any miss fire. If you hear some misses, not a smooth run, it means either you have to replace the spark plugs because one or more are not working or one of the leads to the spark plugs isn't connecting properly. It is recommended you change the spark plugs every 10.000 miles given it's a 15 years old car.
2. If there's a smooth idle run, then there might be something wrong with the fuel pump (which is located close to the fuel tank under the car) or with the air valve which is located near the engine, both can be clogged not passing enough fuel or air required.
a rubber one,should be changed at 50-60,000 miles. Audis recomendation is like 90,000 I think but have heard of them going much sooner than that. A preventitive Cam -timing belt job way cheaper than doing it after it breaks and ruins valves and cylinders!