Trim any visible fat from the chicken breasts, cut each breast in half lengthwise, then cut into 2-inch pieces.
In a bowl, whisk together the oil and vinegar dressing, basil pesto, lemon juice, and Spike seasoning until combined.
Place the chicken pieces in a resealable plastic bag or a lidded container, pour in the marinade, and turn to coat all pieces evenly.
Refrigerate and marinate for 8–10 hours or longer for more flavor.
When ready to cook, drain the chicken in a colander and discard the marinade; let the chicken come to room temperature while you prepare the grill.
Preheat the grill to medium and brush or spray the grates with a high smoke-point oil or nonstick spray.
Thread the chicken pieces onto skewers, pushing them snugly together so they don't spin; use double or blade-type skewers if available for stability.
Grill the kabobs about 15 minutes, turning often, until the chicken is lightly browned and firm but not hard.
Remove from the grill and serve hot.