car running rich & won't stay running

Hi - I am Dave, contributing to RepairPal and providing expert advice since 2010. I have to ask, how do you know or why do you suspect the "car is running rich"? What it sounds like to me is that you have a throttlebody or a transmission concern. If your engine is not operating properly due to fuel delivery concerns, you will find that there is an extreme amount of fuel in the cylinders by removing spark plugs and inspecting them. I don't think this is sounding like what is happening for you. But it's possible. Anything is possible until hands-on testing is performed to determine what is happening. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!