I am getting a really wierd low Idle when i stop the car at red lights, or when I park. The RPMs fluctuate between 400 and 800 and if let to sit to long, the car just shuts off. I just had a dynomax muffler put on saturday, and this started happening sunday night. We did have the battery disconnected for welding, and when the idle drops the lights dim, so they might be connected. If anyone has any opinions, I would really appreciate it. The car is drivable, just really tricky at long stop lights
Thanks in Advance.