For non fuel injected models, on the side of the carburetor there is an idle screw. Turning the screw slightly will raise the idle on your Chevy truck.
check the ait. on yhe left side of carb..it control's idle.
it has a low idle. Can also be a vacuum hose leak.
1500 at first until it kicks down to 850 rpm
No it will not. It only controlls the idle of the engine.
While the truck is running in idle pull out the dip stick and read it.
A 95 does not have a idle air tempture sensor, It was not used on that year, no need for one.
If this happened all at once, check the vacuum lines. A cracked or broken line will cause high or rough idle.
factory spec. is around 25 to35 psi
vacuum leak, bad idle control sensor
I'd start by checking for vacuum leaks.