tazdamaster09

I'm new to the thread and never done this before and not sure how it works so please bare with me while I figure things out. I bought a 2002 Chevy Silverado HD crew cab 6.0L with the 4l80e automatic transmission. I replaced the plugs, plug wires, coil packs, throttle position sensor, idle air control, cleaned throttle body, new fuel injectors, new VSS speed sensor in transfer case, brake light switch on brake peddle and replaced A and B shift solenoids in the transmission, new transmission filter and fluid. After replacing all that it ran and shift good until day two. No 2nd gear one minute then have 2nd gear later on that day then no 2nd gear again. It's off and on when it wants and am at a loss trying to figure it out. Don't know if I'm right but wouldn't think it's a bad trans when it works sometimes. Haven't had any trouble with 1st, 3rd, and 4th. When it does happen 1st starts off great then shifts to 2nd and the rpms run up high in 2nd and then hits hard to 3rd then soft to 4th, when shift in manual 1st works great, no 2nd when it decides to not work, 3rd works good and 4th (Drive) works good, When I try to pass and over drive kicks in rpms run way up until I let off the gas it kicks back into 3rd or 4th gear for normal driving, codes pulled, P0140, P0752, P0157, P0719 (I replaced brake switch), P0741, P0756. There are only the 2 front O2 sensors connected because there's no cats or mufflers and checked all fuses and are all good. Any help with anything I might of missed or looked over, would be greatly appreciated

tazdamaster09

Wow, I was hoping for some help but it's been several days and no help. I'm going to go check out other forums sense no one can help on this one. I know I'm new to how these things work but really thought I could get some kind of help in the couple day that it was posted.