So I recently purchased a 2001 S10 Xtreme. Currently getting it mechanically sound before I behind to tinker with it. So here a quick rundown. When I got it. Had codes p0300 and one for TCC pwm. Figured it was the solenoids. So I took the liberty of replacing all four. Code cleared. Didn't come back but instead had p1860. I've occasionally floored it here and there. And would get a shift solenoid code. P0758. P1810. Once. I cleared them. They don't come back under normal driving conditions. Now, I solved my p0300 (was the fuel pressure regulator). Now I'm consistently getting p0101/p0113 and p1860. The p0101 and p103 will sometimes comeback after a clear. Sometimes not. I'm led to believe this is an electrical issue. Either PCM harness and/or valve body harness. If someone could point me to a way to diagnose this. That's be appreciated. I have a test light and am going to buy a multimeter as well. Would rather not throw the parts cannon at this.