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Is engine getting up to normal operating temp.? If not, suspect thermostat stuck wide-open.
2000 to 4000 miles. Don't push past that. Better safe than sorry.
Here ya go : http://www.youtube.com/watch?v=OplYY-DrNDE
Recheck wiring connections, fuses and relays. Make sure the ground is hooked-up.
Try the estimator at the top of the page. Here is example prices for the parts for DIY : http://www.autozone.com/suspension-and-steering/shock-strut-front/mazda/tribute-2wd/2006/6-cylinders-1-3-0l-sfi-dohc?filterByKeyWord=front+strut&fromString=search
One filter. Here you go : https://www.google.com/search?q=location+of+2012+chevy+express+3500+fuel+filter&espv=2&biw=1280&bih=961&tbm=isch&tbo=u&source=univ&sa=X&ei=VPhPVM6dJviKsQSV8YDoBw&ved=0CDkQ7Ak#facrc=_&imgdii=_&imgrc=wCzhSj5A9r3omM%253A%3BvvoW3pPyhWi_vM%3Bhttp%253A%252F%252Fww2.justanswer.com%252Fuploads%252FDR%252Fdrivefast1971%252F2013-05-05_152445_3.gif%3Bhttp%253A%252F%252Fwww.justanswer.com%252Fchevy%252F7qrl3-gm-3500-express-van-goodmorning-think-fuelpump-clogged.html%3B364%3B336
The EPC (Electronic Power Control) indicator is sensing an engine power loss. The likely culprits are: MAF sensor, throttle body and or crank sensor. Need to have scanned to locate which is the issue between the three.
Doesn't sound like a drive shaft issue. Suspension issue more likely. Check ball joints and tie-rod ends for secure tight fit. Also, check front struts for wear and if they are loose. Other possibility is totally trashed motor mounts letting the engine bounce and shake whole vehicle. Need to inspect to find cause.
They make a slotted socket specifically for o2 sensor removal but you can try removal with 7/8 closed or open end wrench. Main issue : They can be really jammed in there and require a lot of torque to remove. Pre-soak with PB blaster to try to help break free. The slotted socket usually fits a 3/8 socket wrench. Location can make removal difficult as well. Good luck : http://www.autozone.com/repairguides/Ford-Excursion-Expedition-Lincoln-Navigator-2000-2005/Component-Locations/Heated-Oxygen-Sensor/_/P-0996b43f802e7449