So over the winter i installed a howell tbi kit on my 360. It runs alright but i have been having a few problems. Cold it runs pretty rough about the same as my carb did. Once it warms up it seems to idle fine. When driving and I come to a light or stop sign the idle seems to surge some for a few minutes. Also if you rev the engine the rpms take a second or two to come back down. This can be annoying when shifting through the gears. I think that i may have a vac leak but i cannot seem to find anything. How likely could it be that my intake is leaking in from inside the valley area into the runners. It is an eldelbrock performer intake. But the surging idle and the revs that dont come right back down seem to be my biggest issues that i cannot figure out and could use some guidance on.

Thanks
Pat