[delsolguy]

The engine is probably not running smooth because of the CEL. With a little research you can find out what code you are throwing and then you'll know what the problem is. However, it most likely has to do with the O2 sensors. Are you sure you didn't damage one while removing them from the stock manifold? See if any of the wires look bent or damaged in any way, and also recheck that the sensors are all the way threaded into the bungs.