Good afternoon, I recently got a 1980 scirocco with a 1990 g60 motor and everything in it. Ive been fixing mostly the braking system now i want to get it running properly. My issue is when ever i rev the car it will dip severly past idle and then find the idle and if i rev it past 2k it will drop so low it stalls. i have read about 100 posts and starrting to understand more but when i unplug the blue temp sensor the car immediately stalls when its warm or cold. There is an exhaust leak before the o2 sensor(ill be working on that today) and it has old fuel in the system (old 93 with sea foam). wondering about any advice to figure out how to get her to be my daily driver.