So i recently installed a Corksport Fmic and hard piping on my car and finished everything up. I started it in the garage and it ran fine. Then i took it out on the road, drove about a block and it shut off. Now, when i start the car, it sputters and wont stay running unless i open the throttle. Smooths out some when i rev up, but cuts out when held at constant RPM. I checked all of the connections and clamps between pipes. Everything looks good. What do I do or what do i check?