So tonight I noticed my car making a rattling sound when accelerating. I’m not sure how long it’s been doing this because I usually have my radio up pretty loud but I noticed it leaving a stop. It only does it between 1500-2000 RPMS and the only thing I know that it sounds like is when the cam phasers went out in my 5.4 F-150. I can replicate it with no problem by just cruising with the engine at a slight load and it starts rattling like a fan hitting almost. Any idea where I should start scoping out this issue?

Heat shields on the catalytic converters.

timing chain rattle? the tensioner might be going out.

Check the oil in the morning before starting the car.