See if the spark plugs are black... When the cats clogg up They foul the spark plugs, Just like a fire place cloggin up you see black doposite on the walls. you will see a noticable amount of soot on the plugs..
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Michelle/Scott, if no glitch in the computers rev limiter, your exhaust/catalytic converter may be plugged. Have a good tech. check for codes, diagnose and estimate repair.
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Usually a plugged catalytic converter will cause the engine to buck and not want to gain RPM. It is a simple test that most any good exhaust shop will perform, usually for free, to check the cats. They just drill a small hole before and after the converter and check the back pressure in the exhaust.
Chris, Plugged catalytic's can cause this problem, some GM converters have a access plug in aiding the cleaning of them, but it could be older models. In park,emergency brake on ,rev engine to 3000 rpm approx. and have some body beat (not to hard as to damage) on converter with a heavy blunt object(2x4) and see if it loosen soot,carbon build up and blows it out tail pipe. To show your appreciation press the helpful button and follow me on fixya for more tips and info
Possible restricted/plugged catalytic converter causing exhaust back pressure to be too high. You will need a back pressure test performed to see if this is the problem. You can also remove the front oxygen sensor and try revving the motor to see if the exhaust leak created with the sensor removed will lower the back pressure and allow the engine to rev higher
You most likely have a plugged catalytic converter that backs up the exhaust flow over 2000 rpm. Here is a page with lots of pictures of normal and plugged converters. Catalytic Converter Viewing Gallery
It also could be something like a worn camshaft, the timing belt slipped a cog, a large vacuum leak or the throttle not opening fully. If it idles OK. hasn't set any check engine codes and seems to run fine until it hits a wall at 2000 rpm it most likely is a breathing problem intake or exhaust. It could be the muffler baffle has fallen out and plugging the outlet.
There may be oxygen sensors on both sides of the converter making it difficult to just remove the converter without screwing up the computer setting a maintenance code.