Car wont stay idled
I have a 1999 audi a6 that wont stay idled. Codes p1559
throttle valve and p1602 power supply tetminal voltage too
low came up. I had the throttle valve replaced and
computer cleared. The p1602 came back and car still idles
bad. Whats next to do? I need help desperately beibg this is
my only transportation