A customer states that they’ve been experiencing one or all of the following: a rough or unstable idle, abnormal engine noises, engine stalling, lack of power or reduced fuel economy.
It sounds like it could be a variable-valve timing (VVT) issue.
Now let’s pump the brakes for a moment and let’s not rush into things. Variable-valve timing is the process of altering the timing and/or duration of a valve lift event. Modern VVT systems are actively adjusting the intake and exhaust camshaft positions at all times for the best possible engine efficiency and operation.
This video is sponsored by Standard.