i have a 2005 Chevy trailblazer with 113000 miles and my mechanic told me that my trailblazer have a Bad valve and misfire #3 . is a recall on this suv ?

Loss of power

It cracks but wont start wait 10 to 20 then it starts right up then it's fine the rest of the day

the truck with something. Now the seat wont go back all the way.

I have a 2005 Chevrolet Trailblazer Ext Lt 4wd; I have a problem with my
4wd engaging it seems, when I put my suv in 2hi, it makes loud grinding sounds when it goes in to gear and feels like it is netural will not drive also does the same in A4WD. It would drive in 4wdHi with no grinding noises or nothing but now it is starting to do the same thing in 4wdHi; last night it locked up on the highway and when into park mode at 60 miles while driving all of sudden. Was able to safely get it to the side. Was able to get it home in 4wdHi, but now it can only be driven in 4wdHi or 4Lo but grinding can be heard and now the rear differential locks up and grinding is heard and feels like the brakes are engaged in the rear. So I am thinking the rear differential is shot completely.
Is there anything else I should be looking at also.

Just put rack opinion and power steering pump and pulley belt tensioner in my 05 4.2 trailblazer ls. But when I slow down and turn or I'm stopped and idiling the steering is tight. But as soon as I accelerate the steering is perfect. If the gehicle sets awhile it's fine but run it for 20 min or so the problem reoccurs

When I have the air on full blast I can hear what I think is the air compressor turn on. It is very loud and will sometimes even shake the car slightly. It makes a loud clicking noise sometimes too.

code P0305, fuel and ignition systems fine, swapped spark plug and coil, cleared fault, misfire did not follow ignition components, removed plug and coil from cylinder 5 and compression tested, extremely low compression in 5, internal mechanical failure and would require valve job or complete engine replacement
120,000 miles, would rather fix than replace if get a better estimate than $5000

I am trying to install new a/c system but can't find where the expansion valve is located.

When cruising at approximately 45 MPH, the car seems to have a miss but I think what it's actually doing is continuously shifting in and out of overdrive. Coasting or applying more gas and the problem is not noticeable.

No other lights are on, gauges work fine, its confusing