Runs rough, sometimes doesn't start, compression low

#1
Two mechanics say that the obvious stuff like coils are not the cause, and both, independently say it's the cylinder or head gasket and that I might as well replace the engine for around $4200.
Both found low compression.

The third mechanic was on his way to do a leak down test and found a bad pcv valve and a dirty throttle body. I'm going to do that for $500.

Any ideas? Could this cause
Compression is quite low on 3 of the cylinders
  • 1 155 psi
  • 2 97 psi
  • 3 60 psi
  • 4 85 psi
Thanks!
 
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