Last year on a hot day we stopped our 07 trailblazer 4.2I for a short break and after resuming our trip the rep stabilitrack and check engine light came on with power reduced we were close to home and made it there. The next morning things were fine. This happened one other time last summer...

While driving, the check engine light, stabiltrack off, and reduced engine power light came on. I had error codes P0121 P060E P2135 as well as clicking noise coming from the throttle body itself when you would turn the ignition on without starting the engine. I replaced the throttle body as well...

I just got three codes on my truck. P2138, P2135, and P0641. I believe they all correspond with the TPS. I have changed the throttle body because it has an integrated TPS. About 24 hrs later it popped the same codes. What can be causing this?