Codes p1537 and p 1538 are codes for a faulty IMRC valve. They are located on the lower intake manifold.
Intake Manifold Runner Control (IMRC), Vacuum Control
Intake Manifold Runner Control (IMRC)
As for the misfire codes, Check out the upper and lower intake gaskets. Since you have to take the upper intake off for the imrc valves its just a few more bolts to remove the lower intake. The intake gaskets are rubber seals. When the engine is cold the seals shrink and causes a misfire. when the engine warms up the seals expand and the misfire goes away.
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