So today after driving my car it almost stalled a few times when accelerating and driving below 20 mph, and it idled choppy when i started it when it was warm. It's got code 32 and 33. I was thinking maybe the egr valve is sticking sometimes, maybe that would cause low vacuum? When it wasn't running good it did seem like the brakes where harder to push, so less vacuum. This is a california emission car btw. It occasionally sets off the code 32 when on the highway for ten minutes with the cruise set. So do you guys think egr temp switch or the whole valve?