when i drive my ar for a while and come to stop sign/light the RPM drops to 600 and sometimes when i put it to neutral driving the rpm goes up sometimes to 1500rpm
is this a Ignition Coil problem??

thanks in advance....

 

i have a similar problem.... except it happens when im going under 40mph and let off the accelerator the rpms fall and car almost stalls... try cleaning/adjusting the IACV and see it this helps.. also check the ECU for any trouble codes.

 

i did clean mt TB and IACV and checked the ECU...no codes