Drew
When I had my EFI car I had similar problems. When I would mash it though, black smoke would roar like crazy. Also it would buck and surge. At idle it was richer than crazy.
I installed a adj. fuel pressure regulator (from stock) and cleaned my throttle body and it fixed everything. I think it was the regulator. It was amazing the difference it made. I would get one if you have not already.
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2001 Mustang "Mach 1" SVO siamesed 351 stroked to 417ci,Yates heads, solid roller,Trans King glide.
Best 1/4 ET 9.17 (ALL MOTOR)
Best 1/4 MPH 147
My Car
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