Last night, when I came home, after driving for about 30 minutes, about 2 minutes away from parking, the check light came on. When I pulled up into my driveway (not very steep at all), the car died! It took probably about 3 times for me to get it all the way into the garage, and I noticed that I had to give it considerably more gas just to get the thing in the garage. I had a PO757 a few weeks ago, but after I reset it, it has driven perfectly since them. Should I be concerned? I wouldn't be except it seemed like it was difficult to drive it up into the garage.

This morning, after I reset the code, I drove it around for about 5 minutes and it drove perfectly.

I have a 231/234 640/610 cam, stall, stg 2 a4, 3.73's and a bunch of bolt ons.

 

From your description, it is hard to tell if the P0757 (transmission) is your problem or not. Since it affects your cars drivability, I would be concerned.

DTC P0757
Circuit Description
The 2-3 shift solenoid (SS) valve controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS valve is a normally-open exhaust valve that is used with the 1-2 SS valve in order to allow four different shifting combinations.
When the PCM detects a 1-2-2-1 shift pattern, then DTC P0757 sets. DTC P0757 is a type A DTC.
Conditions for Running the DTC
• No TP sensor DTCs P0122 or P0123.
• No VSS assembly DTCs P0502 or P0503.
• No TCC solenoid valve DTC P0740.
• No TCC stuck ON DTC P0742.
• No 1-2 SS valve DTC P0753.
• No 2-3 SS valve DTC P0758.
• No 3-2 SS valve assembly DTC P0785.
• No TFP manual valve position switch DTC P1810.
• No TCC PWM solenoid valve DTC P1860.
• The engine speed is greater than 450 RPM for 5 seconds.
• The engine is not in fuel cutoff.
• The gear range is D4.
• The TP angle is greater than 10 percent.
• The transmission fluid temperature is 20-130°C (68-266°F).
• The system voltage is 10-18 volts.
• The transmission output speed is 150 RPM or greater.
Conditions for Setting the DTC
DTC P0757 sets if both of the following conditions occur:
Condition 1
• The PCM commands third gear for 1 second.
• The estimated gear ratio is 1.6-1.8.
• Speed ratio is 0.5 or greater.
• The engine torque is 68-542 N•m (50-400 lb ft).
• All conditions are met for 2 seconds.
Condition 2
• The PCM commands fourth gear for 1 second.
• The estimated gear ratio is 1.8-3.3.
• Speed ratio is 0.5 or greater.
• The engine torque is 0-542 N•m (0-400 lb ft).
• All conditions are met for 2 seconds.
Action Taken When the DTC Sets
• The PCM illuminates the malfunction indicator lamp (MIL).
• The PCM commands third gear only.
• The PCM commands maximum line pressure.
• The PCM inhibits TCC engagement.
• The PCM inhibits 4th gear if in hot mode.
• The PCM freezes transmission adapt functions.
• The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
• The PCM stores DTC P0757 in PCM history.
Conditions for Clearing the MIL/DTC
• The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
• A scan tool can clear the MIL/DTC.
• The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
• The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.

 

i drove it for 10 miles or so today - on the freeway, getting on it, etc. and had no problems other than it having trouble idling one time. If something truly was wrong, wouldn't it constantly get worse or something?

 

This is a common problem when you install a high stall TC. When you get the code your trans defaults to 2nd gear(limp mode).That is why you had trouble putting it in the garage. 2nd gear start with a TC will feel pretty bad. Just tune the code out and all will be fine.Lots of us have had this problem.