2004 Chevrolet Silverado 1500 Questions

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MAF sensor is new throwing code for both banks lean when gas tank is slmost empty the cel goes off?
Happened a couple of weeks ago as I was traveling north on I-95. I accelerated rapidly to pass another vehicle and the oil pressure tanked. After passing and leveling out the speed, the oil pressure came back up to normal. Oil level is right on the money and changed about 1200 miles ago, along with a new filter. No noisey lifters or bearings. No leaks, just serious temporary oil pressure drop.
This problem occurs before I changed my oil then after changing after a few drives it read accurately. Took the truck on highway got a knock sensor error and the had gauge is back to acting up. When I start the truck it reads the current fuel level but after a minute into driving it slowly goes back down to e. I also have noticed a rattle in my gas pedal when accelerating it occurs around 30 mph
I have a 2004 Chevrolet Silverado four-wheel-drive I turn the turn signal zone and mashed breaks both of them blank in the rear I turn my headlights on turn turn signal I'll hit the brakes they stop anyone help me with this it has the correct bulbs and brake lights were taillights work blinkers work but when I mash the brakes with the lights off both blinker is blinking at the same time when I have the lights turned on our mashed my turn signal and they quit blinking when I mastered bricksissue
changed the trans
my 2004 z71

How long have you had this problem? since it has cooled off

What seems to make the problem better or worse? no start
How long have you had this problem? a few weeks
my sons replaced my intake gasket they pulled the timming shaft and left. now I don't know which way the rotor points or the crank shaft lining and cam.
What seems to make the problem better or worse? no start
How long have you had this problem? a few weeks
Using lot oil approx at 800 miles no smoke except a little when start up
Dinging, ie, earning sound...brakes are good. When I stopped, it stopped, but parking brake light still on. Was flashing when incident occurred.
After the truck runs long enough to get warmed up and I turn it off, it will not start back until it cools down for about 20 min... The motor will not even turn over. I know it's electrical issues but I can't pin point it ya know.. My battery is brand new and the alternator is good. But when I turn the key to the on position , everything comes on as it should, but when I go to crank it.. then everything goes dead until I let off the key from cranking it..
I changed the high/low switch. Hook up a manifold gauge low moves from 10 to 70, high moves from 140 to 70 as the compressor cycles. When I equalize the gauges it shows 70. What could be the problem?
ac blows cold on drivers side hot on passenger side
I have recently put in a new sending unit and ran all new fuel lines on my 2004 Chevy Silverado. After getting everything hooked back up I went to put gas into it in the gas came back up out of the filler neck I tried using I can and also filling up at the gas station and it still did the same thing. So what could cause it to fill up with air and not breathe. The hose on the filler neck is not obstructed or twisted, the vent line is not collapsed clogged or cracked. The vent line is also ran as high as I could run it so it is not hanging down or anything. Could it have something to do with evap? Been chasing so many problems with this truck and it's pretty overwhelming need some input from somebody else.
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