A bad map sensor wont recognize the manifold pressure thus not fueling the engine correctly. Im trying to figure out what map sensor every company (ripp magnuson procharger prodigy sprintex) are using its got to be the same between them. From what a local tuner told me ripp used to use mopars srt4 map sensor because its whats called a 3 bar sensor being 3 bar can read negative and positive intake pressure and 2 bar map sensor only reading negative manifold pressure (vacuum)