Lost compression to left left bank Options

[Willisbegood]

So everything was fine up until a few days ago when I noticed I was having a bit of a problem climbing RPMs when I got on the highway. My initial thought was that my fuel filter was plugged up so I changed it out and that didn’t fix it. I thought maybe because I ran an octane booster in it with supreme fuel that it may have just been running too rich. But it won’t stay running at idle. If I give it gas it will stay running but as soon as I let off it dies out and won’t stay running on its own. I figured it’s cause it was rich fuel so I added regular unleaded to bring the octane down but nothing changed. I then got curious and did a compression test and sure enough the left bank only holds 60lbs. (1&2) cylinders. Cylinder 3&4 hold 115 lbs. does this mean that the engine blew or a gasket blew? Do I need to get a new motor? Any and all input would be greatly appreciated guys thanks!

[porschetub]

Probably still running head gaskets and they have blown out due to the head becoming loose,seen that before,my mate had a 2.0L bus in his shop and the gaskets were gone on one head,there was a large piece of the head blown out on one cylinder.
Disconnect the coil and get someone to crank the engine so you can listen for "chuffing'' noises under that side of the engine,you could remove the rocker cover and check the head torque also before you pull the engine.
No you don't really need a new engine but you may need to carry out a top overhaul to sort your issue,good luck.