2004 Buick Rainier Studders

The video shows the whole thing on a LeSabre. This link shows the belt routing and where to get a new belt.

https://www.google.com/search?q=2005+buick+rainier+serpentine+belt+diagram

There is no switch, they are automatic. There is a sensor mounted on the top of dashboard that senses light, which tells headlights to turn on.

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The Headlight are automatic, try the turn signal switch.

might have issues with pressure plate, / or "if cable" adjustment of clutch cable, and if fluid type have the master cylinder checked might need replacement of the rubber kits hope this helps

I finally received the answer to this problem with my '06 Rainier CXL. The front gear pack (in mine) needs to be replaced. Vehicle is driving AWD, all the time. Expensive repair- $1600. Mine has 93+K miles, the engine is in awesome condition. To repair or not to repair... that is my struggle.

Here's a link to your bulbs.

Change fuel filter. Change spark plugs. Install injector cleaner in fuel tank.

You could certainly try that, but the problem may be in the IP, not the sensor. The sensor is located on the tail shaft of the transmission.

may be intake manifold leak also check fuel injectors they may be clogged