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GMC Envoy Questions

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After replacing computer and trying all re learning sequnces the security lite does not go off.
What does the battery light mean?
what do I do to fix the problem, and what is the problem?
Being having trouble with it not starting sometimes. Checked everything then key was in ignition and the whole car locked down. Couldn't get key at of ignition so took off ignition and unlocked it. Still in lockdown and won't start.
Could a remote car starter have anything to do with it?
car has to be sitting in the heat for a while for passenger door controls to work. and radio volume is very low on fm band.volume when on AM works fine.
So when I pull away from a dead stop the oil pressure starts to go up once I hit the speed I'm going and reduce the gas pedal the oil pressure starts to stabilize also anytime I take the speed up above 45 mph check engine light starts flashing. The check engine light came on this morning and it also has a rough idle almost like it's going to stall out but it has installed out at all just an extremely rough start when the car pulls away from any stop, anyone out there tell me what's wrong
The motor seems to have normal power however when I accelerate, even lightly, it makes a gurgling/knocking noise. It does not sound like a fluid gurgling, it sounds like it's coming from the pistons and engine block. When at speed or idle the motor doesn't make these noises, only under acceleration. I've heard other older cars with high mileage make similar noises under acceleration as well. Any thoughts?
Any tips on where to start to figure this problem out
ITS LIKE I LOST GROUND OR SOMETHING, ONE HEADLIGHT ON WITH NO KEY IN IGNITION, STEREO ON BUT NO SOUND, TURN KEY NOTHING, TRIED NEW BCM BUT DIDNT WORK, SEATS, WIPERS, SIGNALS ALL FUNCTIONING.....ANY IDEAS? I THINK I GOT HIT BY LIGHTNING......
My climate control does not light up
Problem just started and car was shutting off
Car shakes when stopped, in gear and is worse when the AC is on. Have replaced multiple parts, had throttle cleaned, done tune up, etc
I have a 2005 Envoy Denali with 5.3. After filling with fuel the other night it would not restart. After sitting for about 2 hours it restarted and died again 15 minutes later. It keeps doing this. Once it warms up it will shut back off then you have to wait a couple hours and it will restart for a minute then die out again. We have replaced the spark plugs, air filter, canister vent, evap purge valve, and ignition switch. The battery, alternator, and starter were all tested good. Is it possible the fuel pump is over heating?
Have a misfire on No.2 cylinder
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