When Cody gets sarcastic there is a good chance he is right but unable to prove it, which only requires you doing a pressure test. Shotgun posted a great link that needs to be read. It is a short, one paragraph post that only takes about 30 seconds to read.
Nobody is giving you the answer because when people order tuning to cover up mechanical problems the finger always gets pointed at the tuner expecting them to pay for repairs. The excuse is always "tuning caused the part to fail," it could never be a deteriorating part that got pushed beyond its limits. I've seen it posted a few times here and I'm sure PHP has had countless emails that none of us will ever see. Tuning does not work as a bandaid for mechanical illnesses. Just humor everyone and get the pressure checked.
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