I could certainly use some help from someone more car savvy than I am. Recently, my car has begun to hiccup while driving and the idle has become less stable (i.e., not surging, but more like small skipping up & down). Furthermore, I went to the store and my idle stuck at 2500 rpm not matter what I did. Needless to say I burned the clutch a little getting it home. I do have an SCT 4 bank chip that I recently installed. It ran great for the first coupe of weeks before the above symptoms started. The symptoms are more pronounced on a tune setting and less pronounced on the stock setting. I called Bama and they said that it could very well be the old TPS and IAC going out because the chip "demands more of electronics." That seemed at least probable to me. Therefore, I replaced the TPS (Ford TB non adjustable) and IAC with new BWD components. I did not check codes before, but the CEL did come on when the idle hung up, before changing the TPS and IAC. I have checked codes now and I get 121 KOEO, and 121/411 KOER. I'm stumped. What am I missing?