alright im gonna start with saying im not a major audi guy (im more JDM) just bought this because it was good deal. anyway its a 1997 audi a4 quattro runs fine and stuff but i just put in a new pioneer head unit (replaced the alpine that was in it when i bought it). radio works fine all the speakers work but when i start the car itll run for about 30 seconds then bog down and stall. if i turn off the radio (wired in a switch for the radio because the 12+ switchable wire wasnt turning off the radio...?) so if i turn off the radio via the switch the car will run for a couple minutes then bog down and stall. if i hit the gas its fine also i checked the ground and connections everythings good. really confused by this i tried searching the forums and tried the 3 minutes in accessory without starting the car thing still nothing.

PS. car had concert sound system stock and has new kicker speakers in the rear each speaker has its own mini amp

any help would be great