Started my car this morning and everything is all good about 5 minutes later I noticed some lifter chatter. Revved the engine a bit and the chattering went away. Went n a two hour ride trip and on the way back I noticed lifter chatter when I went into the store. Revved engine and it went away. Pulled into the driveway and noticed the chattering again. Checked the oil and it was good. I then check the dang oil pressure and it’s at 6 psi at idle and 22 psi when I rev the engine. Gentlemen please tell me this is more than likely a bad oil pump.