soo about a month and a half ago i replaced my gasket for my intake manifold....ever since then when i warm my car up the idle drops to 200? or alittle above the 2nd line on the rpm....but when the car idle will go up to 900-1000 after about 5 min of warming up,and sometimes the car starts up it just dies out and would take about 8-13 cranks for it to start up again....none of this use to happen before i changed the gasket...BEFORE when i start the car it use to idle at 2000rpm and work its way down......anyone??

 

check your coolant level and burp/bleed it of all bubbles.