I have recently purchased a '95 supercoupe that has a Superchip in it. When I stop at a light, it idles really high for a 30-45 seconds then finally settles down. When driving, it goes like I have the pedal patially pressed down. I have checked the TPS, and no codes are thrown, I suspect the chip, but it is virtually welded into the computer. Any advice, hear of this before ??