A local auto parts store will usually pull the code from your check engine light for free, but the ani-lock light can only done by the dealership.
Throttle body
How to install tps
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should be right underneath the throttle body to the right of the intake.
It is located just under the throttle body on the intake manifold. Follow the wiring harness and you will see where it sets underneath the throttle pulley assemply on the front right side of the motor.
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The low tire pressure light on a 2002 Buick Century is reset by pressing the red button in the passenger fuse box. The light will return if the pressure problem is not fixed or if the leak comes back.
It is quite likely it is the anti-lock brakes activating. When any wheel loses traction while braking the brakes will be pulsed so that the car will not go into a slide. When driving on slippery roads, you are suppose to pulse your brakes to stop. The antilock system does this for you.
I'd suspect a loose, damaged or unhooked vacuum hose/line around the upper/lower intake. Or a faulty throttle position sensor.
Could be throttle plate frozen in throttle body - try to free it with screw driver or wooden dowel 74delta, spent every waking hour trying to fix vortec engine for the last 2 weeks,with same problem, it was the intake gasket, THANK GOD I found it.
there is no way to adjust the idle speed on these engines, it is all computer controlled. unless you are looking for the IAC (idle/air control valve), that is on the throttle body, and uses a 1" wrench to remove after unplugging it.