I might as well sub myself to this thread, although I have been advised through Max Capacity and Tuning Alliance.
05 LGT auto bought 2 weeks ago
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TYPE OF STUTTER/STUMBLE
Steady throttle/Increasing throttle/Both: 20-35mph in the 2-3K RPM range ( like following a slow-poke going up a hill ) and if i downshift to get out of the studder, it jumps into 2nd and takes off like a rocket
MODS
Intake: K&N Panel filter
Exhaust: stock
Fuel: Stock fueling, 93 octane
Turbo: stock
Engine Management: stock
Tuner and revision of tune(if you don't mind): none
MAINTENANCE
Sensors changed: going to clean MAF
Plugs changed: none
Coil Packs changed: none
OTHER SYMPTOMS
Check Engine Light: none
Etc: slight shaking/vibration at a dead stop with foot on brake ( maybe its just a Subaru thing, my dads 03 legacy does the same )
And 18 MPG combined highway/city :/ ( even on a long 2.5 hour drive up to the catskills and back, with no bike roof or anything on roof, got a max MPG of 22 )
RESULTS
What has and hasn't worked for you: all random. today driving from apartment to family lunch it did not do it at all ( merging onto highway, etc ) I am at a 1/4 tank with 93 octane ( was much worse a couple days ago with more fuel )
If something worked, how long has it been working for: using the auto/manual option to keep rpms at or higher than 3K to avoid the "studder range" to get up hills. once I am moving at highway speeds, all is well.
I understand I need a full day of looking over and under the motor and checking out the fuel delivery and spark delivery systems, but it just confuses me that sometimes it drives just fine, which makes me feel like its a ECU problem.
I am considering getting aftermarket UP and DP pipes and having my ECU tuned my Tuning Alliance, but before i spend that money I want to see if i can fix this myself ( is that even possible? )