sounds like the computer is not responding correctly or your IAC or MAF could be plugged up causing the computer to respond erratically. Get a code reader to check the CEL come back on here and post the CEL code.recently my automatic 6cyl. will just be coasting and then at about 1500 rpms it will stick, not accelerate, jump to about 3grand, and then jerk. At just about 94k miles right now and the check engine light also turned on. any suggestions??