My car has the PVR 280F. The engine seems very strong and responses nicely but when in idle it can stall. Thank you very much for your input and I will look into hoses and vacuums, it would make a lot of sense if it’s one of those items- my fuel economy seems normal. I will take a look at the mass, not knowing where to look can make this issue impossible. My mechanic adviced me to buy a new harness just to help with trouble shooting.