Hello and welcome!
Im not that familure with the car but it could be the DMF rattling , engine mounts loose/ worn ,(the bottom gearbox one is under a lot of stress - especially if it is driven hard or tuned) or the car not running on all cylinders (running on 4 :lol: ) due to fouled plugs or faulty coil packs / ht leads (that only occurs at tickover and disappears when the revs rise)
The DMF can produce metal swarf, that can interfere with the crank/ flywheel position sensor, as the sensor is magnetized
I know the ST225 has a DMF because the people that do the SMF/ carbon/ kevlar clutch i got for my car do them for ST225s too
If you check some of these things or get your fault codes read / get a code reader you could narrow the problem down/ eliminate what is >not< wrong let us know how you get on