My car has pulled a p1349 code, which brings up vvt malfunction (bank 1). Are there any common causes for this code? I took it to lexus and they changed out some vac lines thinking that was what caused it, but it came back on. Granted, my vac lines were leaking as there was a hissing noise (like air leaking out of a hose) coming from my engine, and now the noise is gone. Also, when the car is coasting down the road, sometimes it will idle funny, like the engine is about to die. Anyone know what this might be??