LANE A START UP QUESTION

First you need to find out why the fuel pressure is not rising, it could be you have a restriction or some other loss of flow.
Disconnect the fuel hose from the engine fuel RETURN fitting (at fuel regulator above cylinder #4). Connect a temporary hose to this fitting and place open end in a fuel container. Turn ON the main fuel pump for exactly 1 minute. Record amount in fuel container. It should be at least 6 liters.
Repeat for Aux pump.
Both pumps should provide at least 6 litres. (Max Take-0ff fuel consumption (26.8Lph) + 125%=60.3Lph)

We have five engines and the orifice size is 0.7 MM. The other four are normal, only this fuel pressure has a problem.
I checked all the spark plugs today and there was no mistake.And check the connection of the ignition coil but found no problem.Why is it that when I turn on LANE A the engine has obvious shake and RPM decrease?

Have you actually inspected the orifice on the suspect engine.
This is not a time to assume anything.

When operating on a single lane only 4 of the fuel injectors are used.
When both lanes are in service, the two injectors on each cylinder share the duty by injecting on alternate intake cycles.
If you have a bad injector, it may be one of the disabled ones when lane B is operating.

An Injector issue could also be related to the slow fuel pressure increase.

Did you test the fuel flow?