92 Chevy 1500 Lopey/rough idle after letting off gas

Have a 92 Chevy 1500, gets a Lopey idle
right after letting off the gas, seems to be
worse in reverse. Starts great and
accelerates great, just seems to get a
rough idle when driving around in town or
backing out of a parking space, only stalls
sometimes when in reverse so far, seems
to do it worse after truck has warmed up.
The Lopey idle does clear up after a couple
seconds which has me lost on what's
going on. I've replaced the fuel filter, IACV,
spark plugs/wires, rotor and cap, cleane
the throttle body as well. Might have
helped a little? Not sure. Example- get to a
stop sign, drove forward accelerates no
hesitation, staying at about 25mph,
approaching another stop sign so I let off
the gas, gets a bad Lopey/rough idle and
acts as if the trucks going to stall, bad idle
last for 2-3 seconds then clears up and
idles normal. Anybody have this issue?
Been looking around but haven't found an
answer yet