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GMC Sierra 1500 Questions

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Blew hot air off and on before
Going around a curve to the right, the steering wheel will operate smoothly until it reaches a point of resistance until I break through it. It'll then operate smoothly until I reach that one small point of resistance again. No noise or vibrations.
I just installed one on my truck and all it does is turn over. And it seems like the new key and cylinder are getting stuck on the on position, causing the new starter not to disengage
I cleaned ground wires but still wont shut off unless I disconnect battery cable. there is 660,000 km on truck. engine still runs perfect. need help thanks..
Replaced transmission and I get no power to the output shaft. No error codes. Pulled transfer case and I can see the output shaft move. With transfer case in I was able to get the output of the tc to roll until accelerator is used and then it stops until you let off and truck is idle. Fluid is good, filter replaced.
What is the issue. ?
oil leaking from oil filter, oil filter is on snug, its a 2'' puddle of oil after a drive out. no oil beyond the oil filter. could oil pressure switch be bad? if its the main seal, where else would see oil?
Position. Because I hear a grinding noise when the engine is running, when I press the brake pedal the notice stops, how do I fix that. ?
It in 1st, 2nd, 3rd, 4th, 5th or reverse. How do I fix that problem.?
Greatly appreciated, thank you and it's hard to shift into gear
I put gas in it a few gallons I don't know whether as much fuel pump relay or a bad fuel pump or just air pockets in my line
Got the "service 4wd" light, the lights on the switch wouldn't work, also stuck in 2wd. I replaced the fuse, the actuator, and disconnected the battery to try and reset it. The switch still won't work, and still stuck in 2. Probably just need a new switch too? Kinda broke tho and don't want to drop $$ for a switch if it is something else.
i cannot find out definitely if i can use platinium replacement spark plugs in my 2004 gmc sierra 1500 5.3L engine. is it ok to use platinium plugs as opposed to iridium?
I put in a motor, but it doesn't want to start by itself, I did get it started by passing it thru the fuse box in the engine compartment
Super easy without any pressure
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