hey guys, my car keeps stalling I'll start it up and drive it and it will stall about every 30 sec. if i try to restart it right away it wont start, if i wait 5 - 7 seconds it will start again. it shows a code 18 cam crank error . i have replaced the cam sensor, crank sensor, had the icm checked, still doing the same thing. any help would be grealty appreciated.