1990 Chevrolet 2500 Pickup Questions

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First gear Whining while drive.
Stalling when you don’t give it gas.
Different idles.
4wd never engages
there is no water showing in the oil. smoke is sweeter smelling.
Its starving for gas can my fuel pump be the problem
Just replacement fuel pump check service engine light intermittent go off when engine shut off and restarted
What is a fair price for a heater core exchange
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.
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).
This is a 1985 Chevy 2500 pickup. I have put two master cylinders on and am about to put a third in three years. They all keep losing fluid from the back reservoir and leaking it into the brake booster. This truck gets driven very little, usually only about six months out of the year and then usually just short trips locally. what is causing these master cylinders to be going out so often?
This question is in regards to a 1985 Chevy 2500. Is the smallest and rearmost brake fluid reservoir for the front brakes or the rear brakes?
It doent start now. What can be the problem
no heat and it blow's cold out of all the vents
Still wont start. Why
where should i start checking?
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