We have a like new 2012 Chevy Traverse. It's been a headache with multiple alternators, 2 seat belt sensors ($1,000 each) at 37,000 miles and then it was missing / shuddering on inclines. So now at 130,000 miles, I took it to the dealer and paid $140 for a diagnostic on the shuddering. Said we needed a torque converter. $4,000 later. Drives the same. Went to a mechanic I use regularly. He couldn't figure it out after 2 weeks and was waiting on a phone call about a "shifter" when I picked it up. Went to another dealer and they said without codes, they couldn't figure it out but I should clean the injectors since they're due. $250 later they said they'd cleaned the fuel injectors, O2 sensor, throttle body, catalytic converter, etc. Still, nothing changed. Took it to a transmission specialist. They found nothing when driving it so three days later, my husband takes it out and they see something on their computer about cylinder 1 & 3. So, we assumed they would replace coils / sparkplugs, wires. They call today - 2 days later - and they cleaned the fuel injectors...UGGGGHHH. So, now they say they've seen these Traverse that ran rich have catalytic converters that almost melt down. They are now drilling in to check pressure / temp in the converter??? And then if no issue, replacing the coils, etc. Any ideas if this is really a thing? We've spent almost a year and probably $4500 to have nothing change. Been to 2 dealerships and 2 other shops. We're lost at this point but have kids in college and can't really afford to get a new car.