i think the idle is a separate issue..this may be the iac[idle air control]this is located on the side of the throttle body..sometimes you can remove this and clean it with carb cleaner and it will work fine..though you may need a new one
REMOVAL & INSTALLATION
See Figures 1 through 6
CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
- Drain the engine cooling system until the level of coolant is below the level of the thermostat.
- If working space is constricted, the upper radiator hose may be detached from the thermostat housing.
- Remove the thermostat housing mounting bolts, then lift the housing off of the intake manifold.
- Remove and discard the old gasket.
- Grasp the thermostat by hand and lift it out of the intake manifold.
- Clean the thermostat housing-to-intake manifold gasket mating surfaces of all dirt, grime and old gasket material.
FIG : Fig. 1: To remove the thermostat, loosen the thermostat housing mounting bolts ...
Fig. Fig. 2: ... then lift the housing off of the intake manifold, thereby exposing the thermostat (arrow)
Fig. Fig. 3: Remove the old gasket from the housing or the intake manifold (depending onto which surface it is stuck)
Fig. Fig. 4: Grasp the thermostat by hand and pull it up and out of the intake manifold
- On 1.3L and 1.6L engines, position the new thermostat in the intake manifold hole so that the spring side of the thermostat is positioned down, and the air bleed valve is positioned toward the front of the engine.
- On 1.8L engines, position the new thermostat in the intake manifold hole so that the spring side of the thermostat is positioned down, and the air bleed valve is aligned with the matchmark on the intake manifold.
Fig. Fig. 5: When installing the thermostat on 1.3L and 1.6L engines, ensure that the air bleed valve (1) is facing toward the front of the engine
Fig. Fig. 6: On 1.8L engines, when installing the thermostat, be sure that the air bleed valve (2) and the matchmark (3) are aligned
- Position a new gasket on the thermostat, then position the thermostat housing over the thermostat and on the intake manifold.
- Install and tighten the thermostat housing mounting bolts evenly and securely.
- If necessary, reattach the upper radiator hose to the housing.
- Fill the cooling system.
- Start the engine and inspect for coolant leaks.