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Chevrolet Silverado 2500 HD Questions

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the tag lights does also . is there a elect ground on the truck
I am going to replace front hubs see if that is the problem
It happens every time I floor it if I don't floor it it stays at 80. It has always been between 40 and 50 what could cause it.
I have a 02 2500 hd. It has the manual shift option for the 4 wheel drive. My fuses are good and just changed the front acuator. But it won't shift into 4 high or 4 low. I have no power to the front acuator
I have replaced a broken brake line, the master cylinder, and one caliper. I have bled the line several times to no avail.
What else can it be?
Thanks Marv
after I bleed it off it may go 2 or 3 days before it does it again could my abs be doing it?I have replaced the rubber hose and brake pads turned rotors and replaced the clap.
No crank problem.
Found blown fuse and replaced .
Fuse blew on first try .
Sometimes like factory key will turn the ignition sometimes it's locks in place
First of all, GREAT site Thank You.
Truck was stored for 4 years, ran fine previously with 56000 mi, started 3-4 times in yr. Fuel pump went bad and bad gas in tank. All fixed, after awhile p0300 , the only code,came on with a noticeable miss, worse cold. Runs good at speed and accel. Cyl # 4 fouls quickly. miss worse on even side, #1 with only a few. 3-5-7 quite a few. Cleaned MAP & throttle body.Compression 140psi. Checked wires, coils run @ 35-40kv, even though at 2500 rpm they all went down to about 10kv. It was an old scope and had to ck each cylinder individually. swapped coil #4 & #1 no change, exhaust pressure before cat on even side .65psi. Pulled injectors on even bank looking for leaky ones. All held pressure@ 75psi on bench test with good pattern. With EZ-scan tool 6000 A/F ratio 14.6. I have the scan tool results, if they could be of help and perhaps someone that is in the know may be able to come to an conclusion. Thanks Doug
Started truck and quickly moved it to garage and shut off before it warmed up. Replaced all coils and tried to start engine. Engine fires but does not start. Throws a code po446. Possibilities?
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