I have a dezod kit i pieced together on my 07 tc and Just recently had it taken off. WHen i had the kit on the engine light came on for crank sensor but I just ignored it. Now after coming back to stock, when my car is in idle, it jumps from about 750-1000 back and forth non stop and it shakes when it jumps as if it is going to stall out. Any ideas?

have u tried resetting ur ecu? unplug battery and plug the terminals back on

vacuums leak maybe? check and make sure everything was hooked back up secure