i had some marinate (yoshida's brand) that i soaked my pork-chops in. i left it in for approximately 24 hours. when i took the pork chops out, they looked kinda funky. they were kinda hard and had a rubbery texture. but i figured wtf...cook 'em anyway. well, they didn't cook up very well either. they stayed kinda firm the whole time. when i took them off and cut them open, they weren't dry ... but the meat texture was sorta stringy/clumpy ... almost "brittle". i'm a decent grill-master so i'm pretty sure i didn't mess up during the cooking process. so, the only thing i can think of is that i marinated the meat too long. when i checked the label, it said to marinate up to 30 minutes ... since i did about 24 hours i thought that may be the issue???