So my 06 a4 has a rough idle only when the car is warmed up and is in park or neutral. It also stops doing it when the ac is on. I'm getting code p0089.
It's not the fuel pump, the hpfp, low fuel pressure sensor, fuel metering valve on the hpfp, or the fuel rail, and it's not the fuel filter. What can it be? It says it has low fuel pressure. My vag com shows 4bar at idle and goes up to 130 bar for hpfp. Help please car runs pretty strong.
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