I had to chase that problem for months and I finally got it fixed. My mechanic told me that in my case when the o/d light blimks and was shifting hard, it was in "safe mode" which it will resort to when there is a problem. We changed the mlps sensor and the speed sensor and still had the problem. It wasn´t until I changed the plug wires that it went away. I never would have suspected that, but he told me to do it and viola! Ran perfect. Someone once told me that electromagnetic fields from plug wires could interfere with a sensor for the atx. Good luck, John
