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GMC Sierra 1500 Questions

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Mine didn't. Now what can I do or what are my options
Did I do something wrong or is that I need to start it up to get the hydraulic fluid flowing
I know that the tensioner only goes in one way
Is there something I have to replace to make the belt fit
Into a 2001 GMC 1500
My truck doesn't have a 4.3 vortex but the blazer does
Transmission will not catch gears
i have to kill the ignition to get them to come back on. Also wwhen i engage the window switch or turn on the rear defroster it does the same thing even kills the radio. when i bought the truck it had an after market alarm without a remote so i removed it
We have replaced numerous things that were expensive and we were left stranded with no vehicle due to this ongoing issue. I read about everyone complaining on different forums about being stranded and unable to use the vehicle because we refuse to go to a GM dealership and pay over 500 to 1500 dollars to fix an issue GM should have recalled for all of us. I've been stranded with 3 kids on the side of Highway 70 in St. Louis MO in 4 degree whether. Mind you they are all10 and under, and our family is in Illinois. I have had issues with the passlock system approximately 100 times or more. Resetting it only works for so long. GM better step up and fix this!
4.3 - Ever since i replaced my heater core the truck has been hard to start - kills the battery - let it sit for 4 hours or more and if fires right up- drive up the street and back - park it - go back to leave again and it will not start - also, once i get it started i will just let it run in the driveway and after 5 to 10 min it just dies -i have changed plugs, wires, ignitor assembly - I did a fuel pressure test and it read about 56 psi
My truck starts just fine it will shake a decent amount while in neutral, when it shifts gears(automatic transmission) it will shift really bad like it doesn't want to almost like its slipping, when changing from drive to reverse as well it will start shaking more i think due to the lower speeds. No other obvious things to look at though.
I have an annoying lower dash rattle, I believe its coming from the panel below the steering wheel Is this easy to take off?
Or dealer assist on repairs.
anybody else notice this?
New plugs wires air filter oil change oil filter. Cleaned throttle body and replaced gasket 3 weeks ago. Had a rough idle before tune up and still does. Fuel filter was changed about 6 months ago. Why will truck not stay running.
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