Problems with ETM contactless mod
 

Will someone please help me. Obi Wan, you are my last hope...
I fitted a contactless system to my 2001 V70 petrol, and whilst this cured the initial hunting and stalling problems, the car now misses whilst in idle and is stuck in limp mode. Has anyone had this similar situation? I am wondering if I have done the mod correctly, which I am sure I have, though my soldering may be suspect?
I am hoping to find some clearer heads here than on Facebook's forums, as I am at my wit's end.
Many thanks in advance,
Emma