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Throttle bodies are my weak point in the automotive world. Don't know much about them, so here's my question. Can the injectors wear out to a point of increasing the volume of fuel being used? My 93 Chevy truck, with a 350 in it is using more fuel than normal. It has new plugs, new ignition wires, distributor cap and rotor along with a new oxygen sensor. All top brand stuff. The exhaust pipes are black instead of dark brown as before. I'm wondering if the throttle body is the culprit. Any views on this situation? All possibilities are welcome. PJ