I used to have a problem with my r's and w's, both used to come out as L's or owawewlells. I don't do it any more but it's still there if I don't really concentrate on the word. My teachers really helped me at school though... ok I'm being sarcastic there, they used to make me read stuff in front of the class to get a cheap laugh. I think that's what makes me so conscious of it now. But yeah I still go through each day, even though I don't do it anymore, I still hesitate whenever I have to say certain words