Gman, I had a similar problem last hot spell, hiccuping and injector light and it turned out to be injector 1 failing when hot!!
Turn off and let it cool down and would be fine. When hiccuping I tried unplugging each injectors and it was obvious no.1 wasn't working properly. This was also confirmed by measuring resistance with a multimeter.
A second hand injector from Joe and a few scrapped nuckles and all now ok...just need to get air con regassed!!!