I ran over metal in the road a month ago putting a dent in the exhaust and it's been happening since. I cant find a fuel leak and EVAP is undamaged and doesn't flood with gas like on some cars; canister is dry. I removed the EVAP system and it's slightly better. Injectors all work. I cant get the car into a paint oven with this happening.

Anyone have anything similar happen? I cleaned the fuel filter inside the tank years ago, but the seal under the back seat doesn't leak the fuel vapor.