Suggestions?? Idle will not go below 1500RPM regardless of engine temp. As if cold-idle is stuck. All I did was replace the thermostat... Burped with heater on, no vac leaks, stumped... Ideas?? (I am new to this 2.7 motor) Thanks!

85 4Runner - With NEW Marlin 4.7 Gears!! It's a whole new beast!