I have a built 2000 z28 with a few small problems, such as its burning oil and it sputters when it rains.?

Its a 383 ls1 stroker motor, with F.A.S.T. 102 mm intake and MAF sensor and it is a daily driver. It burns 1 qt of oil every 300-400 miles and when it rains or when i sit in traffic for long periods at a time it will sputter like its misfiring, any info would be great and thanks in advance