HELP>>> My Idle went up then go down and it almost stall when I was in the parking lot in Walmart waiting for my wife. It went up to almost 2k rpm for couple second and then go down to 500 rpm but i shut the engine off and turn it on. So far it's running fine. Can anyone tell me what's going on?

 

There are so many things that could cause that...

It sounds like it could be a vacuum leak... thats the first thing i would look for.

 

really? that's it?

 

I would check all your vacuum lines...check under the intake manifold, I had them pop off from under there before.

 

vacuum leak, bov venting the atmosphere, i.a.c. is going bad.

 

Your MAF sensor coulg be going bad or might just need to be cleaned.

 

numerous things. vacuum lines, dirty maf, leaky bov. is it throwing a cel???

 

Hey I'm having a similar problem, pretty sure its a vacuum leak, the engine bay was just pressure washed so I figure a line either got damaged or popped off, where are the places that I should check, my bov is not vta and the connection is still tight

 

Wouldn't a loose vacuum line be an automatic CEL??

 

turns out it was my o2 sensor, it threw a code so I'm replacing it.