have you tried driving with you EGR blocked? my truck has a blocked EGR and its great, from what people tell me, they can add some power as the air is not as warm going into the cylinder. Per haps you need to check your fuel filter or filters, i don't know much about TBI systems but i suspect that there is a fuel filter in the TB, try looking for one and if you find it inspect and replace if necessary, check for an inline and a tank filter also.