fast efi problem

im at my wits end. ive been on the phone all week with fast with no luck. ive rerouted wires, disconnected any other electronics, rewired my tack, hooked the keyed power for ecu directly to battery, set the iac, set the tps several times.... im gonna rig up a fuel pressure gauge to see if theres a problem there and if that don't work then unfortunately I'm bolting my carb back on wich is a shame, when this stuff works it works awesome but its of no use to me now.
I talked with fast about the ground at the o2 sensor and they tell me it grounds through harness.