Originally Posted by Running925
RPM's are jumping coz u are low on coolant & it's not making it's way through the IACV like it should.
you probly still have a leak. Check your coolant hoses
Yeah. That's right. PLUS.... It could be a leaking water pump OR a blown head gasket. I'd take it to a radiator shop and have them tell you. First thing I think they'll do is take off your oil cap on the valve cover to see if there's any coolant where it's not supposed to be. Happened to me. I decided to just spend the $30 at the local radiator shop to find out WHAT was going on.
I hope it's not your head gasket, but you'll save yourself a headache by having them look at it.