Originally Posted by chevy82
Try disconnecting the maf sensor near the air filter box and drive it. It puts the truck in default mode and bypasses the sensor. If that doesn't help you might have a clogged convertor or resonator. I had blazer come in 2 weeks ago, they replaced the convertor , but the resonator was plugged. It set a 02 sensor and maf sensor code also. It was plugged so bad I couldn't get the truck up to 20 mph. I was also told it never ran bad and just happened all of a sudden.
I changed the MAF sensor. Still had the same problem. Out of frustration I cut a hole in front of the catalytic converter with a saws all about two inches long just the width of the blade, to see if the maybe the cat was clogged and it would release the back pressure . It runs a lot better. I think that I have a catalytic converter problem or resonator problem. Any thoughts?