My 99 K1500 Suburban is throwing P300, P0507, and P1351 Also my Tranny when in D will shift from 1st into 2ed normally but will not shift higher when i take my foot off the pedal she will go into neutral and when i push the gas she will go right back into 2ed..... the engine idles at around 650rpm and sound like she has a lopey cam

I Replaced cap, rotor, plugs, and wires and I am about to do i tranny filter change and replace all the shift solenoids could that help or is that just a lost cause