Maybe you should try going to AAMCO, they do more than just trannys.
They have a advertisement deal with 97.1 ("FREE FM") If you go there and say that you heard about them by listening to 97.1(free fm), they will look at your car and diagnose the problem for free!!!...thats what the commercial says so atleast you will know what the problem is for free...
I looked on their web site and found that there is one at 519 S Brookhurst Street, Anaheim, CA 92804 so they are pretty close to you.
Their number is
714-635-0860
Ive never gone to AAMCO, but I trust Tom Leykis 