04 TL w/ 6MT 130k miles.

It's well maintained, had the timing belt/pump done at 90k. I did the clutch/fw/pp at 110k. I use all amsoil lubricants and change them frequently.

AEM cold air intake, thermal throttle and manifold spacers.

I always run 93 octane. In the last 5 months I've noticed under 1/4 throttle or less it will buck a bit and hesitate, kind of choke. Under 1/2 throttle to max is runs flawless.

I've replace all 6 plugs and coils and that did nothing. What else should I start cleaning/replacing? Injectors? Do any of the airflow sensors tend to go bad? Throttle sensors etc? Tear the whole manifold apart and clean everything? There are no codes or anything so I just need some guidance on where to start.

Thanks

 

check your cats. With 12 years already on them they might be showing their age

 

Does it do the same using the cruise control?

 

I'll check on the cats. I never use cruise control but I'll check it out. Today it was 95° F outside and the car didn't hesitate at all. Yesterday it was 80°ish and it was hesitating a ton at low rpm, minimum throttle.

 

Maybe a valve adjustment? My car never threw codes but around 102k miles at idle my RPM would drop under 500, and then die. I thought I was stalling at first but then when I carefully paid attention to when my foot was on the clutch, there was no way it could be me stalling.