molemonlaw

If you are facing any problem with your used car, you can claim it: Document the repair orders that indicate the problem in your used lemon car Notify the manufacturer of your car or vehicle of the defects and nonconformities, directly Submit the warranty dispute to the arbitration program listed with the help of your state lemon law attorney for used cars, to improve your chances of receiving proper compensation

Did you torque the plenum according to FSM (torque value and sequence)? And yes, the cat can cause it to stall and run like crap. You might pull the plugs and see waht they look like as well. May have buildup from seafoaming. Just guessing. If it is manufacturer's defect you can claim it. Contact an expert lemon law attorney in your state.