Please help me diagnose this

Thank you for the comments. I will get the head gasket fix instead. (And yes I did go into the shop asking for a head gasket replacement, best thing I could have done is letting them diagnose it but I did get all the symptoms pointing to that and my coolant is running low) the shop owner is a very honest guy and he seems to be very experience the way he communicated about my car. He did ask a few questions about my car to make sure it's really the head gasket and not just jumping into it.

 

I will get it fixed next Friday and let you guys know how it goes.

 

just an update:

The mechanic tore down my engine and shown me some stuff. There was a lot of carbon build up inside the engine. Valves have a lot of carbon build up and one valve has fluid leaked through. He said the valves are very worn down and I saw a few big bumps to what might be carbon build up (?). And he also said something about cracked/warp engine head? I don't know half the things he said but from what I've seen the engine is in bad shape. Wish I have taken some pictures for you guys but I didn't want to bother the mechanic too much.

Quite a few spots where the coolant were leaking through, one of the spots were between cyl 2 and 3 and the compression of one of the cylinder was going through the other. Normally he would recommend a new engine but I did tell him I'm not keeping this car for long, maybe a year or so. We agreed that the most cost effective solution right now is just to go ahead and replace the gasket.

Bought the car at 172k with all maintenance record. Engine occasionally vibrate at low speed / low battery but it was so rare I didn't think much of it. EGR and misfiring code (third cyl) came on at around 220k. I had EGR sensor replaced under warranty enhancement, spark plugs changed, EGR cleaned (it was almost 100% clogged), new PCV valve. Made it to 267k but I guess the damage was already done.