i would go to a 190 fuel pump anyways cause its always a good thing to have for little mods or big future plans and the ignition box under the air filter is the ignition control module and thats always good to upgrade also, like quickstang said try cleaning the maf really good and spray out the throttle body while your there, you said your fuel pressure is at 40 psi, try going to 42 or a little more, but i wouldnt go more than 45 psi, but it could also mean that your injectors could be clogged and only spayin a little gas