1994 Chevrolet 2500 Pickup Questions

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My truck is a 94 Chevy cheyanne 3/4 ton. I bought it without a key and now I need a key for it to drive obviously
Decided to look up codes In truck 94 Chevy k2500 4l60e automatic and came across with code 83 from the ALDL terminal A and B port
I have a 94 Chevy K 2500 as I'm driving down the road and I give it gas on a hill or even on a straight away it will hesitate and stumble and as I'm climbing Hills the RPMs will reach 2,500 and then drop down to 2,000 RPMs and jump up to 2700 RPMs but my miles per hour will rapidly decline even if I put the pedal to the floor the motor will just hesitate and struggle even more almost like it is trying to die I have replaced the cap to the rotor new spark plugs new ignition coil wires new idle air control new EGR solenoid none of which has fixed the problem does anybody have any suggestions that can help me get my daily driver back on the road and running correctly again
Water leaking from back of engine passenger side looks like a freeze plug
I am hearing a rattling noise under the truck and a whistling noise near the TB. It's also hard to start and it shakes. When I try to start it I have to hold the throttle down to open the gas and then it cranks, when Idling it shakes and you can hear a whistling noise around the TB and Distributor. I hava replaced everything from the Distribitor, O2 sensor, cool temp sensor, wires and plugs, I bought a new TBI already put together, replaced the EGR Valve, MAP Sensor, it's been timed 2x,, and whith the new TBI it came all new parts except the housing; yet I am hearing whistling noieses around the TB and underneith the tuck on the side of the battery I hear a slight ratting noise. I am getting codes 12 and 15.
I have replaced all of fuel system, and the firing system. don't know what else to do.
Spark plugs seem to be below exhaust manifold
changing the head gaskets and need the torque specs for the bolts
I still have heat just no fan. all fuses seem to be good and the fan worked fine. I shut off the truck and when I started it up again no fan. is there a simple answer for this?
I am having problems locating the oil pressure sending unit.
My trucks windshield wipers work but nothing comes out when I try to use the washer fluid. There doesn't seem to be any leaking out of the hoses, the bottle is full of fluid. Is there something else somewhere to check or do I need to replace the pump?
Thank you
Not so long ago when I would turn on the turn signal, the speedometer dial would jump up and down while sitting still.
Now it is doing it even without the turn signal on.
What's the problem?
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