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Whisk oil, cilantro, lime zest, lime juice and salt in a large bowl. Set aside 3 tablespoons of the mixture in a small bowl to use as dressing. Add shrimp, jalapeños and plums to the remaining marinade; toss to coat.
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Preheat grill to medium-high.
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Make 4 kebabs, alternating shrimp, jalapeños and plums evenly among four 10-inch skewers. (Discard the marinade.) Grill the kebabs, turning once, until the shrimp are cooked through, about 8 minutes total. Drizzle with the reserved dressing.