xyooj180sx

I have order 2 reflash chip from Scott, when i recived it a couples of weeks later they bolth it went bad, 1 went bad the first week and the other later that week. when I start my car up, and it shakes and wont idle right, like its running on 2 clyinders. I tryed to put the old tune back in it it starts up and idles fine. So I contacted him and he said send it back in and he'll fix it. USPS tracking# says hes recived it 2 weeks go, iv emailed him like 5 times, still he hasnt email me or respond back. has anyone have problems with there tunes? has he always slow on his replys????