If it has a carby ( you didn't bother to mention carby or EFI), have the carby overhauled as from your description, the accelerator and power sections of the carby are not working, Blocked jets or low float levels
if it is EFI have the fault codes read to check for MAF/VAF sensors and/ or heated oxygen sensor problems
your description indicates that the engine is not getting excess fuel to provide engine rpm acceleration be it either carby or electronic system
SOURCE: 1995 Chevy silverado with a
I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.
This problem
is commonly caused by a dirty automatic idle speed control valve and
throttle valve but always run a OBD2 (1996 and newer) or a OBD1 (1995
and older) fault code as well as the cleaning procedure. Buy a can of
throttle valve cleaner (do not use carburetor spray cleaner!) from
NAPA or Carquest (made by CRC chemicals) and spray it into the air
intake while the engine is running, use up about 1/2 the can, engine
will try to stall hold the speed up, shut it down and let it soak for
30 minutes, restart and blow out the remaining fluid, shut it down
and disconnect the negative battery cable for 5 Min's to reset the
base idle control
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