FYI, the absence of the resistor and relay for the fuel pump is a positive in troubleshooting this. The reduction in power to the pump that it provides at low loads isn't a negative and helps low load operation. If its absence were the problem though you'd know by checking with a wideband for an overly rich mixture. It will not hurt the fuel pump to leave it in place and no, it doesn't reduce the power to the pump to that significant of a degree... most of the negative commentary you see concerning that device comes from ignorance spread through old wives' tales or is misinterpretation from feedback from people who've had to tune after market engine management components around it... Sometimes it's just easier to delete.
