TYPE OF STUTTER/STUMBLE
Steady throttle: Steady slight stumble at idle. Car has stalled in slow traffic and one time in parking lot with car in drive and foot on the gas(simulated traffic).
MODS
Exhaust: SPT cans and CNT Highflow Cat DP
Fuel: 93
Turbo: VF52
Tuner and revision of tune(if you don't mind): Road Tune
MAINTENANCE
Sensors changed: Rear O2
Plugs changed: OEM
OTHER SYMPTOMS
Check Engine Light: Rear O2 sensor (P0420)
RESULTS
What has or hasn't worked for you:
Carb cleaner tested vacuum lines/Intake Mani/Injectors, Cleaned MAF sensor, Changed air filter, SeaFoamed fuel system
Replacing the O2 sensor removed P0420
Timed the car to get a better sense of when things were happening. The timeframe below happens each time(0:00 to 4:40).
Started timer
0:30 Almost stalled twice(had batt unplugged)
3:56 Almost stalled/big stumble
4:30 Started hunting for idle (possibly from entering closed loop)
4:40 Slight stumbles are constant/no code/rpms remain at a constant 800
18:00 Carb cleaner tested vac lines, intake manifold, and injectors(no _______change in rpm
25:00 Shut the car off
Drove the car for well over 30 minutes. Gave her the beans and everything. Power is all there still. Stumble is felt during low idle, i.e. sitting in parking lot or slow traffic. Low on funds right now so can't really get it diagnosed. Possible front O2? Gunked up throttle? I can at least afford a nother bottle of Seafoam for the intake. Any other ideas for an empty wallet guy?