After a new catback install the car (holden monaro) cuts out at 4000rpm just accelerating, it jerks violently going dead like a hardcut limiter at 4000rpm. Doesn't throw any error codes although it did come in with a crank angle sensor code among others that have been cleared. Only started playing up approx 100kms after the cat back exhaust install. it is not a mechanical cut out it is complete loss of spark or fuel
ideas would be great.... if not it will be onto the dyno and start searching