I am new here. I have a 02 Blazer 4.3 with 132K on it. I started getting sluggish power and shifting problems. Got a P0101 code and took it to a mechanic. He replaced the MAF sensor. It wasn't the issue or not the complete issue as the problems still continued.
I continued to drive it and the more you drive the worse it gets (i.e, the more it warms up the worse it gets). Reduced power especially going up hills. The check engine light came on and got these codes - P0756 Shift solenoid B, P0101 MAF, P0131 02 sensor Bank 1 sensor 1, P0137 02 sensor Bank 1 sensor 2 and P0151 02 Sensor Bank 2 Sensor 1.
Do I have a clogged cat? Any other ideas?
Thanks in advance!

 

Check the flow of exhaust coming out, When warmed up ,in the dark look at the cat. I`ve heard that they will be red hot (glowing) when clogged