I have a 97 s10 blazer LT with the 4.3 and it idles fine, just won't run over 1/4 throttle. It will creep along about 25mph but when I press the gas any more, it cuts out and falls on it's face. No idea what it could be. I've ALREADY CHANGED the TPS sensor, fuel filter, dist. Cap and rotor, all with zero change. Any help would be greatly appreciated