blinking codes NORMALLY means misfires. That indicates, usually, bad plugs. BUT since you replaced the plugs less than a month ago, I would make sure the tune you got is a good fit for your car. Do you have a way of scanning and tuning? If so, there's a BUNCH of resources out there to help you, ranging from a few guys here to the DHP forum itself.
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WizAire CAI w/9" K&N & HV3, 2.5" d/p w/h/f cat, Cobra CB, PowerSlot slots w/Hawk HPS, GR-2s, GMPP handling kit, NextLevel STBs, Pilot Sport A/S Plus tires.
98 L36/MM5
RaC