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2001 GMC Yukon XL Denali Questions

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it turn over but want start
When the steering blocks it also shut down the engine
This occurred when I stopped and put it into reverse. It will go into drive but makes a grinding noise.
bright seems ok
Will this vehicle function properly as a 2 wheel drive vehicle if I remove the drive chain from the transfer case?
My Yukon will only turn in easily in one direction, the other direction has no power steering. The pump sounds fine, and has the correct level.
What is loud noise upon rapid acceleration? When I accelerate very slowly expecially from a full stop no noise occurs.
I seem to be experiencing a lot of detonation under minor accelleration both around town and on the highway. I also have the piston slap at startup, but the noise on the road sounds more like detonation. I've tried high-octane gas, but that hasn't helped. My truck has 190,000 miles on it, and has been well cared for all of those miles. Any ideas on decreasing the detonation?
when i step on gas pedal a lilttle bit then let off the lights go dim an idle goes down for a few seconds which cause my truck to stall when waiting at stop light or backing up I changed spark plugs and wires ,battery,alternator and the fuel filter what could this be thats making it cut out like that???
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