Not a CPS, but the original early '99 PCM code (XLE4) had an advance cruise power function programed into it. It helped fuel economy at cruise speeds. Other engine manufacturers had similar programing at that time. The EPA found a reason to object to it under the guise that it was not tested and certified during the engine certification phase (Note: Testing that feature was not specified in the testing criteria, thus it was not tested). Remember the huge fines that were extracted from the engine manufacturers in that time frame. The manufacturers had to remove that feature from the programing in future engines and reprogram existing engines when they came in for work. Thus many of the unrequested reflashes from XLE4 to XLE7 and XLE8 that have been reported on this forum. However, there was a shift flair problem experienced by some, not all, with the XLE4, reprograming did help those who had the problem.