This could be a whole heap of issues, storing the vehicle for such an extended period of time, you will need to check all your engine's parts. In other words, perform a full service. You may even need to drain the fuel and put in fresh fuel, as the old fuel deteriorates over time. Also check your electrical earths are corrosion free. Also check the wheels are free to rotate, they could be binding.
You could have something wrong with the computer causing the error message on the scanner. Do this connect scanner and turn key to run don't start vehicle. See if this give you error or code. The backfire is caused by gas getting into exhaust system. You could have a wheel locked up causing the abs light to come on.
SOURCE: my audi has no power. when you step on gas. car
The throttle position sensor needs to be reset with Vag-Com. This happened to me a couple times and I paid $100 to the dealership both times. Now I have Vag-Com and the OBDII cable and I do it myself.
SOURCE: i have a 2002 audi quatro A4 V6. the battery goes
unhook battery positive and install test light in between the post and the cable. if it has a draw it should come on dim. then unplug the fuses one at a time and when you pull the fuse and the light gose out thats the circut with the draw. then refer to what that fuse runs and correct the problem by inspecting that part and repairing as needed.
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