'84 4 cyl , RPM drops too slow

what would cause the RPM to drop slow?
when I push the clutch in/let the gas off and shift, I find myself waiting for the RPM to drop so when I let the clutch out it would be a smooth shift and not be wearing my clutch out.

'84 Silver 2M4 SE

somthing holding the butterfly open in the intake would be my first guess

sticky idle air control is possible... faulty map sensor, vacuum leaks are also a possible cuprit. Does it idle smooth? at what rpm is low idle?

You said 2m4 SE, are you sure it's not a 2m6?

2M4 2 door, mid engine, 4 cyl
yes I'm sure, it has an Iron Duke

Idle is smooth after it is warmed up, about 800 rpm
when Its cold it does have a problem of rpm dropping and engine stalls
I just tap the gas to keep it from stalling.

I'd check the idle air control motor.

well every now and then i will start mine in the morning and it stalls on me...put it like this...if u have a 5 speed...let it warm up even in warm air...because when u start shifting...it is a lot smoother if it warms up...