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2003 GMC Sierra 1500 Questions

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The battery was in hooked for a week removed transmission and put bk in
I turn on ignition , no noise from the back seat. fuel gauge reads 1/2 full. start engine, no start sound like its out of gas
What seems to make the problem better or worse? neither,
How long have you had this problem? today
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
Or dealer assist on repairs.
The coils aren't firing at all, everything else working including fuel pump, replaced crank sensor, and cam sensor too. Lost. No codes coming up, all grounds checked
To fix one day they just turned off and never came back on
Truck has 215k miles on it. Im thinking its misfiring? Maybe a coil pack? Help me out please
It runs fine after the engine warms up to normal operating temperature. Why or what causes could there be?
After Driving to store truck wouldn't restart After some testing found alternator failed so replace. Started find
drove few miles again wouldn't start. Tried jumping- check starter & battery
Disconnected power to Alternator after 10 min. reconnected truck starts fine WHY???
when i first turn the key the light works. when i start the engine, then switch off, then key on, the light may or may not come on. checked connector. is the problem in the instrument cluster or the computer module under the seat?
Brought a keyless remote but truck wont allow me to enter program mode!
I PUT A NEW TRANSMISSION IN IT AN A NEW TRANSFER CASE BUT REUSED MY OLD TRANSFER CASE MOTOR BUT ITS STILL SLIPPING ON OF GEAR?
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