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Get the charging system checked. Suspect battery or alternator issue. Then get an engine code read done at an Autozone for free and post the results.
Get the check engine code read for free at an Autozone and post results on here to further assist you.
Sounds like the power steering pump has failed...need inspected to be sure.
Fuel level sender either has an intermittent short in the wiring or is starting to fail. Need to check wiring and replace if necessary.
Try automotix.com for a possible larger selection to choose from.
Is the dash showing an open door? Even when you know they are closed? Possible door ajar sensor is failing or needs cleaned out very well.
Try the estimator at the top of the page.....varies from different locations.
I have to assume you have a 3.5 liter engine......the first diagram is all you need to locate it : http://www.justanswer.com/chevy/5xwod-change-oil-filter-housing-oring-gasket-2006-3-5-litre.html
Is the check engine light on? Do you have good fuel pressure?
You can try this : https://www.youtube.com/watch?v=VO9Xu6QakNI This to remove the glow plug caps : https://www.youtube.com/watch?v=GtpBAtHOspE