Don't forget that I also get the P1514 with my ported 58mm TB.
Still wondering what Ffoeg has on his engine except for the 2.4 inlet and 2.4 TB.
So far the SC TB's have been no problem on cars with breathing modifications (Vocky and Alessio).
I am not convinced this is a potentiometer issue. If it was there would be an error code refering to the feedback of the TP being wrong.
Mark