To operate the HVAC (heating, ventilation and air conditioning) system while the engine is under load and not producing vacuum.
check for a vacuum leak.
That would be a vacuum reservoir.
Test it with a vacuum gauge.
18 to 21 inches of vacuum is factory on all engines.
Yes
check your answer
yes and they look pretty good
Yes, there is no reason you should not be able to change the oil by yourself in a 1996 Chevrolet S10.
cost to replace timing gear on 1996 chev s10 4.3
GOOGLE!
Look under the battery tray.
Yes you can.