My buddy has a 1988 Mustang, california car with Mass Air. He gets a check engine light when driving the car. When we try to run a key on engine running test, the engine stalls as soon as the computer tries to go into self test mode. We ran a key on engine off test and got codes 67 and 85. We're going to replace the vacume lines going to the charcoal canisters but I doubt this will fix the issue with his engine stalling when trying to run the KOER test. Any suggestions? Thanks