I have a 92 camry and I'm having idling issues. At standing my car idles at about 800rpms and jumps to 1500-2000rpms then after running for a while it tends to stall/bog out. When going to start it back I have to wait 3-5 mins in order for it to crank back up. I bought the car about 2 months ago and it was running fine. I tried some DIY on it to include new air filter, spark plugs, and seafoming it. It doesn't do it all the time but when it does I'm usually in traffic and its kind of embarrassing. I'm new to this so please be easy on me. Help if you can. Thanks in advance!!

 

Might check ign coil, cap and rotor.

Ign coil case can crack.