Schuy Okraj-Stuckey

Looking for some answers. I just purchased a used GMC 137K miles not too long ago. Had the P0306 code come up, replaced coil pack and spark plug, then had a P219B code come up along with a rough noise almost like a clutch grinding sound, when accelerating, but would stop when I let off the gas. I am assuming, with limited knowledge, that this is probably a fuel pump going out or a clogged filter? Anyone else had anything similar to this issue? ETA: Will be going into the shop on Wednesday, just don't want to get the runaround on what is wrong and repair costs.