I have a 95 Chevy silverado 4.3 V6 TBI. Lately taking off from a stop within a couple seconds of pressing on the gas, it will stumble, i guess you would call it. Basicly its like the engine stops, i hear a puff of air that seems to come from the throttle body. And then keeps right on chuggin. Just jars your forward some, and then it picks itself right back up. When it first started it would only happen once. Traveling about 70mph it will also stumble doing the same "stop and go". Ive changed the oil, Fuel filter, fuel pump is 3yrs old, injectors spray mist still (One has a very very slight drip to it, but would that cause this?) Im lost and Check engine light has not come on.