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1991 Chevrolet 2500 Pickup Questions

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Why won't my ac blow cold air? Installed new compressor, accumulator, bled and recharged system. There are no leaks. Everything works but no cold air.
also I can hear in the fuel tank when I turn the truck to on it sounds like it is shooting fuel back into the tank is that normal
thought it was low or empty so went to fill it and noticed it was leeeking from the cap quite a bit when i pulled off the cap i noticed that the fluid wasvery dard and bubbly but looked to be hot dose my pump need to be replaced or can i fix it by cleaning out line or something?
my engine just started knocking. when its cold the engine knocks quiet but as it warms up and gets hot it knocks loud. the oil pressure is low at a stop and it knocks loud and sputters a little. really slow and chugs when accelerating but the knock quiets down a little when driving but its still there and the oil pressure is normal. it sounds like its coming from the drivers side.
it stalls out like it gets to much fuel.have to press all the way down on gas to restart.be driving along and it just dies or starts chugging.sometimes the check engine lite comes on and sometimes not.blows heavy black smoke when restarted.also is hard to start on cold mornings will die if you dont feather the gas for first few mins
injectors putting out too much fuel, poor idle to stall, and black exhaust
my sterring wheel collum wabbles at the tilt section. how can i fix it.
leaking lube from seal. do i need new yoke too...or just gasket.
MY RING AND PINON IS BAD i TRY TO GET ONE FROM DIFFERENT PLACES BUT THEY ARE ASKING ME FOR A NUMBER THAT IS LOCATE IN THE DIFFERENTIAL AND I CANT FIN IT CAN SOME ONE HELP ME PLEASE.
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