The customer reported that the vehicle starts and revs up fine but idles erratically.

The vehicle presented with an erratic idle while still being able to rev freely. A fault code for camshaft and crankshaft correlation on the intake cam bank 1 was stored and returned after clearing. The timing chain and guides had already been replaced, and the timing procedure was carefully followed and double-checked. Despite this, the correlation appeared incorrect when compared with a known good waveform.