i had my fuel injectors cleaned a few weeks ago by a certified mechanic and he also cleaned the throttle body with carb cleaner. but after the process i noticed that my car hardstarts when the engine is turned off for an hour or two. But i don't encounter the problem in the morning when i first start the engine. it only happens when i park the car for an hour or more , and then when i start it the problem is there again. can anyone please help me. thanks guys!