Liam Eure

I recently installed 2018 gt Intake manifold and long tube headers on my car along with a VMP 93 tune. The car runs great while on hard throttle. But when I try to drive like I have some sense it has a weird "surgey" off and on the gas type acceleration. It also does it when I down shift to accelerate but only if I cruise in that gear before hitting the gas. It just doesn't seem as smooth as it used to. Is it a vaccum issue because the 2018 gt Intake manifold has different hookups. I had to kind of "wing it" due to no one having a half decent video on installing one. Also the 2018 manifold has 3 female connections. 2 for the imrc (i bought plug and play harness) and 1 for some vaccum thing(they're blue connectors if that helps) my stock manifold both of the blue connectors plugged in. The 2018 only has 1 plug so I plug 1 in right? Idk this is beyond me maybe a tuning issue. Anything helps I'm ignorant to this so dont be a A$$.