Car intermittently starts after changing Camshaft/Crankshaft

No the computer won't need to be reprogrammed .I have seen the sensors fail and wiring harness fail. A professional grade scan tool allows key engine sensor data to be analyzed right off the scan tool without having to do intrusive testing at each sensor.I would check the basics first but look for and verify fuel pressure and spark when the engine fails to start. I would test the computer for inputs and out puts when the car won't start. It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online If it did come down to a computer problem a company in Livermore CA, Fuel Injection Corporation can test and repair the computer for you, but you need to do proper testing before jumping to any conclusions.