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Have you put a real gauge on it to see where the pressure is? I have an 05 Silverado with north of 300k (4.8L) on it that had low pressure at idle and barely OK at speed and the lifters would collapse at idle. New oil pump and problem solved. It was likely the relief valve but the pump is crank driven on an LS motor and I wasn't paying for that job twice so new pump it got.

Kevin



No I havent put a real gauge on it yet... but at
low rpm it rattles, at 1200 or so its ok... I
will put a gauge on it to see what it really is...
if its low on pressure I'll slap a pump on it