i recently bought a 94 blazer 4.3 vortec and it is hard to start. when i finally get it started it will idle but as soon as i press the gas it bogs out and stalls. i replaced the cap and router wires plugs fuel filter and pump. i cannot figure out what the problem is. if i press the gas slowly it will rev up to about 3\4 throttle before it bogs out but if i hit the gas to the floor it will automatically stall. when i put it in drive and hit the gas to move it will bog out instantly. if someone knows anything about this let me know please for i am out of ideas

Do you have any fault codes showing. I think that will be your next step.

How's your air filter. Your truck doesnt need much air at idle, but as soon as there is load put on the engine, or in your case you reving it up, it requires much more air.

sounds like it cant breath

yes either air filter or a map sensor. the map sensor senses the load on the engine if it is reading incorectly then it would die when u hit the throttle