Chevrolet 2500 Pickup Questions

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gradually the heat is blowing more cold air? the fluids is up where its should be but im not getting the heat i use to get why am i not getting heat ? help ..
Truck always kicked-back when starting as if timing was advanced. Previously replaced ECM. Took to garage, they replaced dist & timed w/ meter - still kicked back but started & ran fine. Also replaced starter. Last week tried to start it. Spins over freely but no start. Gage needles spin totally upside-down and move slightly as engine cranks. Tried a few times, then things returned to normal & it started. Happened again, but problem is continuing this time. Replaced battery cleaned ground connections to block & body - problem still persisting.
oil leaks bad. theres a large nut on the bottom side of the housing where the oil filter screws on, i've replaced the o ring a couple times now and it still leaks bad. is there another housing I can put on that does not have that &%$#$% o ring.
turns on for 1 or 2 secends and shuts off i put new ignition and bypass antitheft unpluged coolant sensor tryed resistor and still not working do they sell sensor for the tumbler help
I can not get the spring on the back pad to compress enough the install the pad
What is a fair price for a heater core exchange
I have replaced my fuel pump 3 times, the last time it only lasted a week and it's out again. the first time there was a burned spot on the ground wire on the harness in the tank. replaced the whole assembly. and still having the same problem.
I suspect there's a wire missing from the sylenoid. It has positive from battery and the purple wire going into firewall. Been trying to find wiring diagram only for starter and ignition. I have no idea what else can do it. Like its absolutely dead. No anything when I turn the key.
After replacing headgasket check engine light appears randomly while driving at wich time the truck will idle slightly higher than normal
I've checked the front brakes and the pads and rotors appear to be ok. plenty of pad left, and no grooves in the rotor. But sometimes when the brakes are applied, it sounds like it's metal on metal ( a terrible grinding sound).
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