[86porsche]

hi all.im new to this forum and only have my 86 928 a few weeks so am not too familiar with the car yet.my problem is when i go to switch off the car with the ignition, the car will just keep running.iv found if i pull relay xvi the one with test on it the car will shut off but wont if i leave this relay in.i have tried swapping with another relay but this did not solve it,iv also noticed that when i do turn the ignition key to off the car will run rough but will still run with tis relay in and will only stop when i pull it.so just to recap the car will run with this relay if its in or out but wont shut off if its in.any suggestions would be appreciated.thanking ye in advance.cheers