2003 GMC Yukon A couple problems, maybe related?

2003 GMC YUKON
59,000 MILES • V8 • 4WD • AUTOMATIC
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STCUNCC13
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I noticed a couple days ago that my car was having a problem starting. I have to push the gas to get it to turn over. Also sometimes I get a message that says "Reduced Engine Power", and all cylinders dont engage, which in the manual says it is a problem with the cooling system, I checked all the fluid levels and they are normal. Also when I drive the oil pressure gauge seems to react on how I am accelerating, going from high back to normal after I accelerate. Are these problems related? If not what do I need to do to fix?
Feb 19, 2008 at 11:55 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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