everytime i let my truck sit for a while it will flood it self without me even pressin the gas. ill go to turn it over and not even touch the gas and it'll do a little stumble, somtimes, then i might press the gas once, somtimes i dont i just keep turnin it over. and it wont start. even if i do press the gas and hold it, pump it. it dont matter it still wont start. and it smells like gas out the tail pipes. the only way i can start it is when i spray carb cleaner down the carb then it will fire right up. i dont get it???????