Driving the car on road and it suddenly started shaking badly

OBD read misfires. I went ahead and changed all 6 spark plugs and 6 coils as well to the best of my ability. When I turn the car now, it was shaking violently then shut off. Tried that few times. Checked obd and it said ignition coil b primary circuit misfire and cylinder 1 misfire in red and ignition coiI 4 control circuit in warning. (Check attached image). I then reinstalled either all of only the affected spark plugs and ignition coils. Now it was out of the danger zone but it is still throwing the warning message for ignition coil b control circuit and the previous P0354 code. (See image 2) which also shows cold engine start which I couldn't find much on online. 1 person took off the throttle body and cleaned it and worked for him, I did the same but no luck. I took it to mechanic after being unable to figure out since I am a self learning and this car is far too complicated than today's cars but they said in order for them to turn on the car and diagnose problem, they need to change the transmission filter which require disassembling and engine and couple other things. That alone costing to $700.00. I think it should not be that complicated of a case so asking here if anyone has pointers on what could be the problem that I could try to play around and fix it. I have read it many times that you don't need to change transmission filter so going with this mechanic might be the equivalent of a shooting my own foot. Please let me know what can I do to figure this problem out and get this car working. Let me know of anything else that I can help with.