idles high sometimes 3000rpm light on sometimes .what to check? cars hot or cold on 1995 Buick Regal

leaks coolant from intake manifold seems to stop when car is hot.but idle problem still there sometimes when hot or cold. could leaking manifold be the problem. after driving on highway about 30 minutes when i came to stop idle sometimes high .
service light on sometimes . not all the time

2 answers
if coolant leaks from intake manifold u must repair first because coolant may go where it dont belong and give u more problem and it can have a very big vacuum leak that will cause the engine to idel high
agree with auto tech but leaking water from intake could mean poss vac leak at intake also. repair may fix boths issues