Catalytic converter??? 1997 4.3 4X4

[cherokeejohn]

Ok, I'm looking for some sudjestions here. I normally hang out out on the 67-72 side as I drive a 72 C10, but, prior to that I've had quite a assortment of S10s/15s and Blazers/jimmys. my wife just bought a 1997 blazer 4dr. 4.3 vortec 4x4 auto. It has 165,00 miles on the odometer. While searching thru the truck I found Some paper for old registrations. repairs, etc... To the point! the service engine soon light is the only dash light lit up so the wife stopped bt advanced and had the code read. It came out to sat 1) MAF sensor, and 2) O2 sensor #4. She then went by a mechanical and trans mission shop to get opinions. both places agreed that the trans and Tq Con. are fine and they believe the CAT is clogged up. ??? It runs great, no leaks, but it wont tach up above 3000 RPM, and it wont shift up or down properly. theres no slipping in it, but i cant get it to get up to higher speeds either??? any Ideas????