I have a 2003 Mazda Tribute V6, 229K miles and has a rough idle at startup. The car will reach about 800rpm and sometimes accelerates around 1500RPM by itself during startup for a good 10 seconds then goes back down to around 800. The car will have a rough idle for a good minute before i guess it warms up and then stops? I'm wondering what this could be. Maybe a IAC monitor? Also it has a flickering oil light, when the oil is completely full. Wondering if i need to replace the oil pressure switch too? Thanks!