$12,345 · AUDI allroad 2002 runs but has issues - lots of new parts but too much

was a great car but have run into issues. first off the new parts i put it : arnott coilover suspension brand new brakes and calipers brand new tires regularly maintained oil changes / premium gas sometimes it needs a boost to start it so it might need a new battery - only if left for a long time there is a check engine error light on now and the last time i got it maintained they said to ignore it, now when driving the transmission feels funny. so im selling as - is i need the parking spot. i paid 5000 for the car 4 years ago and have put atleast 3 into it. im looking to get atleast 1750-2500 for it. please email as my phone is not working