2001 Frontier Rough Idling

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#1
I have a 2001 Nissan Frontier 4dr crew cab, v6 with 125,000 miles. Recently the check engine light came on and it has started to idle roughly, hesitating, and choking when stopped. I found the following TSB and thought it looked like a probable match. Does anyone have info on this TSB? Is this something I should address with a service provider or should I first try using fuel injector cleaning additives to my gas? Pls help!

Component Description:
33. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS Bulletin Number: NTB01033A
Vehicle: 2001 Nissan Frontier
Summary:
SUBJECT REGARDING FUEL INJECTOR CLEANING FOR VEHICLES WITH ROUGH IDLE, HESITATION OR MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0300 - P0306 STORED. ( NHTSA ITEM NUMBER - 625512 )
 

speedy2890

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#2
first find out what the code(s) are, and then go from there.