If you have a compression leak into coolant system it should show in radiator as bubbles .
A broken injector line flare is common if lines are removed and or overtightened , they crack just above double flare .
You can pull the injectors from the tubes , and using a spark plug style compression tester with rubber end to seal inside tubes , find out IF bad valves are creating starting problem .
If low on power when running could be injecting problem , timing problem as the stroke of the injector is set with a pin gauge to adjust the compression of plunger in injector .
HV7 injectors used in most engines .
Bad starting can also be lack of air from dirty oil bath air filter - element or bowl full of dirt or sucking water into air system . The small opening in bottom of blower housing that is suppose to be open is often closed off with a 1/4 pipe plug as it sometimes looks like it leaks oil - but is a drain opening and needs to be kept OPEN
Rack out of adjustment so both injectors are not timed right or opening will cause loss of power .
Dirty fuel filters so injectors do not have fuel supplied at proper flow to and from housing will create a problem - fuel pump is low pressure and not injection pressure unit and supplies around 40 PSI to fuel rail in head and to injector in and out lines . The outflow from back of head has a restrictor to create backpressure before returning fuel to tank .
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