Originally Posted by serpico1

Well, It basically just stopped happening. Although, I did find that the boot connector for the vaccum line that runs to the PCV valve was cracked and although at normal idle it didnt seem to be leaking, if you jiggle the vaccum line, then you could hear the hissing and the engine would start running rough. So, I replaced it. dont know if that was the cause, but the engine has been running fine ever since. So, maybe at the higher speed, the vaccum line started to vibrate and the leak caused the misfiring. Thats all I can assume. Although, i find it strange that it was happening at almost the same speed and rpm everytime.