Check engine light is on and is hesitating under exceleration.

need to have trouble code read most auto stores offer this service for free the code will assist in proper repair

there are many things that could cause that from bad gas to weak fuel pump or dirty inline filter or timing chain could be weak or dirty intake or bad catalitic converter or no converter or even a vaccum line off or cracked or even a bad EGR valve so you see theres alot of things that cause poor exceleration or idle. Hope this was some what helpfull.

the light does not have to be on. there should be a "freeze frame" of the problem when light was on. Any auto shop should be able to check it for you.

check first for restricted fuel filter or defective fuel pressure,try plugging the return line of the pressure regulator if it runs ok..replace the regulator but remember not to run the engine for a minute.its just the procedure of testing the regulator..ok?

It could be a sensor if the check engine light is on, or could be plugged up cat converter, due to lack of maintenance, or could be plugs and wires needing replaced ,does this do it more when it rains.Basically need to get to a Certified Tech to get it Checked!

Spark plugs can cause sputtering during exceleration or can be TPS( throttle position sencer)

i would have your muffler checked it may be coming apart inside and causing increased back pressure hence the louder noise

Does it hesitate when climbing a hill, too? Might be a fuel pump or fuel pump filter. Suspect these components when an engine stalls or hesitates when more gasoline is required.

I agree with emissionwiz check the fuel filter and maybe check the ignition timing as well its a good place to start,good luck to you