Problem 1: you have a Vac leak and/or incorrectly set tps.
Problem 2: Your engine is running in limp mode, incorrectly set timing, or your fuel supply is weak. Make sure your s15 pump is not a low pressure pump. A vl external pump is a nice common high pressure pump.
Problem 3: You already created a thread about this before, there is no reason to make multiple threads on the same topic....