Yeah mines been doing that since I bought it, it doesnt do it all the time, I changed a bunch of stuff on the car and finally bought another complete throttle body off ebay with a good tps and it ran like a new car after I changed the unit over with a working throttle position sensor. I unhooked the battery and removed the backup fuse in the fusebox under the hood to make sure the computer didnt remember who it was (because it was a bastard) and it took about 5 miles of driving for it to actually idle again, it kept dying but after it re-learned the engine it ran great.