THE CAR IDLES VERY HIGH

I JUST GOT DONE BUYING A NEW IAC SENSOR FOR MY INTREPID AND IN THE INSTRUCTIONS THAT CAME WITH IT, I REMEMBER IT SAYING SOMETHING ABOUT RE-ADJUSTING THE PINDLE. WELL I THINK I MIGHT HAVE MESSED UP THE ADJUSTMENT. I HAD IT IDLING PERFECT AND I DROVE IT ABOUT 5 MILES INTO TOWN, AND NOW IT'S IDLING HIGH AGAIN. BUT I DID GET A CODE OF P0340. WOULD THIS CAUSE IT TO IDLE FAST? AND WHAT CAN I DO ABOUT THE PINDLE WITHOUT HAVING TO SPEND ANOTHER $70.00? PLEASE LET ME KNOW. THANK YOU VERY MUCH FOR YOUR TIME.