Hey guys i have a problem that i have got to get fixed, if i don't get it fixed i may be forced to sell my truck

something i do not want to do, but i cannot afford to pay insurance on a truck that is not running, i am at my wits end with this problem and it is driving me nuts!!!!!
when i start the engine up (starts up just fine) and get it reved up the thing starts to sound like a go cart engine when i rev it, i know it's not the carb because i just rebuilt it and there was nothing wrong with it, but i think it may be my egr valve that is not closing fully, but i don't know. if any 1 can help you will be saving the life of my REZLUV from the unthinkable fate of being sold. thanks all
