I had posted a week ago about the car losing all power after 3000RPM. I put a 1/2 tank of 93 in it and a bottl eof seafoam. It will now make it up to 4000-4500 (even once at 5K) but starts majorly missing after that range. Once again, at a standstill I can rev it to redline with no problem. I am leaning towards fuel or timing. Any suggestions would be greatly appreciated.