I have an 07 Camry 2.4 LE that has no Codes but has hard start and hesitation. New plugs, ignition coils, Fuel pump. Had P0301 error changed Injector no more codes but still hard start and hesitation.

 

That's a lot of new parts...was that all for this issue you're having? 07 is kinda young for the coils and fuel pump I would think. Who did the work? Yes, that question is relevant to the issue. Little brief so far on what's going on. Any more details on when it happens or how its acting?

Perhaps the quality of the brand has gone downhill with newer models. But I wonder. How its driven is also a factor, among others.

Sorry. I'd be reading too for answers. Battery not too old, connections solid? Starter is another part to search on.

New or old, ignition, fuel, spark, and yes electrical could all be possible suspects.

 

out of all the new parts you listed I don't see a fuel filter, did you replace that too? how many miles are on it? Does anyone hate you enough to pour stuff in your gas?