Difficult starting

Are you referring to slow cranking speed, which is a starter/cable/connection/battery issue? Does the engine crank normally but it has to crank five to ten seconds before it starts? That is a fuel pressure issue. Have you checked with a pressure gauge to see if the fuel pressure drops off after the engine has been stopped? Do you mean the engine has to cool down for at least an hour before it will start and run? If so, verify spark and injector pulses are missing when the problem occurs. That is related to the crankshaft position sensor or camshaft position sensor. Have you read and recorded the diagnostic fault codes? If there are any, please list them.