whistling 1997 Taurus

whistling 1997 Taurus
My 1997 Taurus posted a code of insufficient EGR flow.
I swapped out with new egr valve two years ago and i heard whistling
Because my emissions test is due this year with the state in two months
I took it off the intake manifold and noticed it had one missing valve gasket.
Bought two new gaskets and found the whistling dropped about 95%. It will still give a quick little "peep" in a much less noticeable whistle but am concerned it will cause the check engine light to come back on. Should I just get a whole new EGR valve and have it be OEM? Should I be OK for now?
I just want my car to pass this year's inspection. Massachusetts has a really tough emissions control policy and the amount of time since you last reset the engine light and the type of driving conditions the car's computer has stored.

Please help.

  pnettle89