When you are with the BTTF2 Delorean and Activates Hover Mode, the Game suddently crashes. Different of how it works with BTTF4 Blue Delorean, that works properly. To prevent the crash from happening, you need to delete two files in the CLEO folder:
I notice it was these two files when i was trying to find a solution using Sanny Build 3. These two files contained the id of the Hover Mode BTTF2 Delorean (A.K.A SPARROW) and no presence of the id for the BTTF4 Hover Mode Delorean (RNCHLURE). Because if BTTF4 Delorean worked without a problem, then it couldn't be in the same script as the BTTF2 Delorean (because it would crash too).