Anothe 95 Jimmy problem

As I mentioned in an earlier thread, I had the EGR valve changed less than a week a ago. The truck has been running fine the last few days (driven about 40 miles). My kid is driving yesterday doing about 45mph and the engine goes up to 2000 rpms and stays there. Stops the truck and lets it rest. Starts again and now it's idling at about 800 rpms and is shaking and wants to stall. Gets the truck home and has a hard time breaking. The breaks were checked out two weeks ago and the system bled. No SES light.

I tried starting it this morning. Engine will start but idle is rough and wants to stall at first until I give it some gas. It's idling at about 600-800 rpms. Tried this a few times and the same thing.

Any suggestions as to what's going on now? Could a vacumn leak be the cause because of the breaking problem. Still no SES light on. Thanks.

mine also does something like that, it feels like the brake booster isn;t working and it hissed when I touch the break pedal... vaccume leak???