Engine won't rev past 2000 RPM(?)

[tlc80s]

Curious to know if you found the solution to this? I’m having the same symptoms. Have 94’ but recently came across an intermittent issue where it will start to stumble. Doesn’t matter whether I’m uphill or flat, whenever the issue arises it won’t rev past 1500-2000 rpm until the issue goes away and I can head on my way, but it’ll come up later down the road. Cats have been removed, don’t see any dents in the exhaust, just replace the plugs a week ago, just want to know where to start.