Hyundai Repair: Hyundai hesitates, throttle position sensor, bosch platinum

Question
2003 Sonata, 2.7 ltr.  Just replaced plugs with Bosch platinum +4 #4418.  No problems until about 2-3 days later.  Car hesitates then throttles up and down when accelerating.  Can't drive over 40mph continues to drop to idle and surge back again.  Problem seems to stop when connector to throttle position sensor is disconnected.  Any ideas?  Thanks.

Answer
Presumably, you needed to disconnect the throttle and cruise cables to remove the plenum.  Check the cable adjustment.  There should be a little slack when the throttle is closed.  If that's okay, you might wish to break out a voltmeter and check your throttle position sensor readings.