Having trouble getting rid of a high idles on the honda V6 in my car. Couldn't find any vacuum leaks. Replaced the IAC. The car still idles around 1200-1500 rpm and pops out the exhaust a little. Have some codes, P0141, P1298, P1607, P1768, and P0450. Was running good, then I started it a few weeks ago and the idle was high and uneven. Not sure what else to check. Seems to rev out ok.