We put a fuel injector cleaner in the gas tank, all the time. It is not hestitating or sputtering. It just won't crank over the first time like it always used to. Now It takes 2 and 3 times cranks before it starts.
When you say doesn't crank over the first time do you mean it cranks over but just doesn't start right away? I'm a little confused. If it doesn't crank that means nothing happens or no crankshaft turn over when you hit key.. When last time you did good tune up on it? Also, fuel injection cleaner in the tank a little different than doing deep cleaning.