E36 IAC?

[toomanycamaros]

@bennyfizzle

Yeah that doesn’t really happen with these cars, the cats are awesome, set well away from the motor, and there’s not much that can plug them upstream.

does it sound like its straining or does it just hit a hard wall at a specific rpm (like a limiter)

I know its not a common problem but with the state he got the car in catalyst materials inside the converter could have been damaged. If all other options are exhausted pulling the upstream O2 and checking backpressure might not be a bad idea