A very plugged up fuel filter could do that.
Key on Engine not running 55 - 61 psi. Engine running pressure should decrease 3-10 psi.
The idle or pulley will have movement in it, when the engine is shut off. It can also have a visible wobble while the engine is running.
If you are checking Alternator voltage, It should 12.8 volts to 14.3 with engine running. Battery voltage is 12.3---12.8 with engine off.
Inadequate fuel pressure. If that 2000 S10 Blazer has a 4.3 engine, it needs 61 to 66 psi (engine off with fuel pump running) to run properly.
about $2000
This is unwise, an engine that is not near 195 degrees is not running efficiently. The ECM and BCM control the fan.
Vacuum leak?
Our 2000 mercury cougar does not start up and stay running. We were told the catalytic converters went out on the engine. Could this be true!
in 2000
Yes
NO. They are not even close to being the same. Chevy redesigned everything in 2000.
The vacuum lines on a 2000 Chevy Silverado run between the intake manifold and multiple valves across the top of the engine. The vacuum pressure is generated by the engine's compression.