Silicone grease on weatherstrips will make them last longer, seal better, and not stick or squeak. Apply silicone grease with a clean cloth. During very cold, damp weather frequent application may be required.
See Recommended Fluids and Lubricants.
Chevrolet Cobalt Service & Repair Manual. Intake Manifold Gasket R&R
1.
Remove the intake manifold cover.
2.
Remove the air cleaner outlet duct.
3.
Disconnect the engine harness electrical
connector (1) from the throttle actuator control (TAC), Fig.
1.
...