1995 CHEVROLET BLAZER User Comment / Complaint

I know it's been a while since this post was made but I have been having the same issue for over 4 months. I have put over 3,000 dollars into my car for fixes including A new IAC and temperature gage, my ball joint snapped two minutes after I got off the highway over a month ago, and I am about ready to drive my car to the dump or put a sign on it saying New Parts. Currently my issue is the accelerating in RPM's and its just getting worse, like when I am stuck in traffic on the highway my car literally jumps at cars in front of me. Did you you find a solid solution for this problem?? Also associated with it is it revving up to 1800 RPM's and back down to 500 almost like my car is haunted, along with holding the RPM's at about 2000/2500 RPM's. My check engine light hasn't come on since I replaced the IAC, but the issue hasn't gotten better and my MPG is rapidly dropping, I used to average 22 mpg on the highway now I am down to 12.. HELP!!!!!