RPMs going up as you described sounds like perhaps a vacuum leak. Any chance you bumped a hose partially loose while doing the prior work? In any case, idle it in P and gently push wires and hoses around with your hands, to see if moving anything causes a change in the way the engine runs. Also, assuming you don't have a vacuum gauge, try spraying a small bit of carb cleaner in the engine bay to see if that changes the engine speed.