I know this sounds strange, but it really seems like my car that has been LS1 tuned has power losses at times. It happened on more than one occasion. I brought it back to get retuned and everything was fine. I was wondering if there was a knock retard occuring that was tapering the timing a little. Sound feasible? I was also told that on certain occasions when that happens (the PCM forgets it's new program) that putting in a half a tank of gas actually resets itself back to performance tuning. Comments?