More Grand Cherokee problems

[jeepaholic]

Ok..Now this POS has started to have 2 more issues..One is that the idle when you crank it stays high for way to long..Not everytime you crank it just sometimes..It has also developed what i think is some sort of vaccum leak..It has a definite whistle that occurs every now and again...It never happens under acceleration..Only at idle or when coasting..Give me some pointers guys..This is a 2003...4.0

[Windowsrookie]

Clean the IAC and throttle body.