Display MoreOne thing to always check if your Slingshot is acting weird is the vacuum cap underneath the throttle body on the intake manifold. There is a nipple that has a cap on it and it sometimes will work its way loose. Usually on boosted setups, but I have seen this happen on a NA setup too.
If you see a nipple with no cap, you have a problem. On the below picture, the left side of my far bottom right blue hose is going to where that nipple is on the stock Slingshot. It is capped when stock.
Doubt this is the issue, but it is a quick thing to check and to zip tie so it doesn't fall off at a later time.
In this picture, can someone please tell me where I can get that hard intake pipe after the connector? The stock one is definitely robbing the engine of power from the rubber being expanded due to heat.