I have an Infinity 2000 g20 automatic. i have replaced the 02 sencor, fual filter, mass air flow,fual pump, engine and transmission and i still have the same problem. the car will not shift from 2nd to 3rd gear with out tacing out to 4000 rpms or not at all and dogs out like its starving for gas like it wants to cut off. have anyone else experianced this problem and can help me find the solution.