Hoping for some Help!!!!!

[Choprolla0616]

Hello and thank you for reading this post.

About a week ago i was driving my 07 corolla LE and when i was steeping on the gas that car would stutter and not accelerate and the CEL came on. So i checked it and gave me a P0303.
P0303 =
A P0303 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.

so i went and replaced the sparkplugs, cleared the CEL and i was good to go.
Next day i drove the car and everything was fine.

2 days ago i had my car parked outside and had the engine on and all of a sudden it stated sputtering like it wanted to shut off, i thought it was because i was on E, so i went filled it up and samething happend. NOW when i drive the car everything is fine, car accelerates fine and drives fine BUT when i stop at a red light or put the car in park it starts stuttering like it wants to shut off plus i hear some backfire. I cleaned the MAF Sensor and topped off the collant.
now im out of ideas. i was wondering if anyone could help before i bring it to the mechanic.

Thanks.

P.S

its a 2007 Toyota Corolla LE, Auto, with 66k miles

[mikered30]

Did you get the Ecu recall yet?

[Choprolla0616]

you know i got a letter months ago stating that there was a recall for the ECU and that they would mail me a letter to say when i could go get it done but i never recieved a letter so now that u mention it i called the dealer and gonna have it done on 3/25

[mikered30]

That may fix your problem. You can try to switch coil packs but usually it is the ecu. There is a tsb out for this code.