This issue has me puzzled to what it could be. when i accelerate at wot i get some pinging at the high rpm level say 5000rpm or so. it is sparattic not always at 5000rpm some times anywere between 3500 to 5000rpms and it looses power when this happens. it only does it for about 1 to 2 seconds and then it picks right back up. it will do this like 1 or 2 times while i am accelerating. and some times not at all. I have gone through everything that i could think of like timing, fuel, plugs, wires, leaks exc. i just dont know what it could be besides an injector freezing up in the rpms. could a injector freezing up cause this problem. also whats the best way to find out.