Idle speed depends on which engine you have. V6 around 550 RPM, V8 around 650 RPM. High idle speed could be due to vacuum leaks or a bad IAC valve. The SOHC V6 vacuum leaks are common due to dry. brittle, shrucken upper/lower intake gaskets/O-rings. Vacuum leaks can also be caused my cracked/broken vac lines/hoses pretty much anywhere. Is your check engine light on?
Issues with the tilt wheel effecting your turn signals are typically due to the wires pulling out of the multi functions switch or broken wires. Common problem.