A piece of advice from an old mechanic. If you change numerous things you will generate numerous issues. Put back all the emission controls, the problem was probably the injectors. Try running at factory specs then make modifications one at a time so you can judge the results without so many variables.

 

When i bought my S5 from this guy, he had the same semptums. and my s5 blewup on the way home. lol. good luck on the fix