Monkshood.

This sudden starting of the engines is "normal" for this simulated aircraft,  in real life the Alison engines take a lot longer to spool up and reach operating speeds . This fast start up in simulation has been noted by many real life pilots and flight engineers, you will just have to accept that it is part and parcel of the CS C130.
Hope the start sequence worked for you. Like I said before, the sequence works for me even though it would not probably work in real start up situations.  What I have noticed in the 1.1 version is that I no longer need to select each engine generator with the "red light on", I select bleed air to an engine, press the start button for 5 or 6 seconds and the engine starts OK and then I bring the selected engine generator online by selecting reset and then putting the engine generator switch into the 12 o'clock position.  I can also start number 3 engine first without the ATM being switched on, by using the GTC bleed air supply only to number 3 engine, pressing the start button for 5 or 6 seconds and then select number 3 engine generator.(I still have to select the battery switches etc before attempting the start) After number 3 engine is up and running I can then start the ATM and use the ATM generator for whatever purpose I need.I could not do this in the original version.
It seems like different computer systems allow different operations in this simulated aircraft, one guy cannot switch on his bleed air switches in 2D mode but can switch them on in Virtual cockpit mode, other people cannot operate various parts of the auto pilot, yet I have had no problems with any of them and my system is not top end but just a standard run of the mill computer.  

Hope you are enjoying this fine aircraft.

Loadman.