When I'm in gear and push the clutch in when I'm coming to a stop somtimes my RPM's will come way down below idle and sometimes it even dies. What causes this or what can I change to fix this problem? It does it mostly when the A/C is on. I have no mods to the motor, no pulley's, etc. Battery and alternator are about 6 months old, plugs, cap and rotor, coil, and plug wires have about 20K on them. Thanks a bunch!!