It took me a lot of BJs before I was able to come from one, but then at some point I found out something that works for me. If the girl fiddled with my nipples at the same time as she was giving the BJ, I could come! Now, since that's a bit specific, it may not work for you. - But try the parts of the body that works best for you.
I still can hardly come from a BJ without the nipple stimulation, so it's not that it removed the prob, I just learned a way around it