i have a 92 z28 305 automatic will high miles 240K, when i'm driving it and i let go of the gas pedal and the throttle closes and rpm drops to idle it drops to far and almost wants to stall or does stall, it stalls almost everytime i do it in reverse, however this is all only happening after my engine warms up, so when i first turn it on and it's not up to operating normal temp it's all fine n does do this, also same with my oil pressure it says on the dash that my oil pressure is fine when i first turn on the car but once it gets up to operating temp my oil pressure is low in the red line, i have replaced my idle air control valve and oil pressure sensor and fuel filter, what else could be left to cause it

 

Im searching this post for the same problem. Im hopeing the sensor is bad, and I don't have to install a new pump.. 85 305, carbed