Be sure you have good gas and check the fuel pressure just to be sure. My friend just had a new fuel pump die on him in one day of use.

I'm really thinking you have an electrical issue somewhere like a connector not making good contact.

 

What sorts of gremlins can a low battery cause?

 

Low battery or a bad alternator can cause a lot of problems that are voltage dependant. Many sensors work off voltage and changes of state. When you get crazy lights on your dash, like all the lights blinking...usually a sign of a bad alternator or a low battery...

 

This sounds very much like my car when it was having issues. It turned out to be the ecu. A voltage spike from either a battery charger or the alternator could have fried the ecu. My car would start sometimes and run fine and others it would idle horribly and then no throttle response at all. Eventually it would go into limp mode. We checked many things and did replace the maf and go back to a paper filter but for me the ecu was the problem. We also replaced the throttle body as we were getting a code pertaining to that. In the end it was part of the ecu that controlled the throttle signal to the throttle body and also where the traction control and psm functions in the ecu were located. New ecu and reflash and the car runs like a champ. I hope your issue is cheaper than this. Good luck!

 

Hey there, we haven't met but I'm sure we will soon. The best tech in town is Steve over at Drivers Source (Memorial Dr). He and I went through many small issues like this when I was building my tiptronic. He will be your best bet in town to finding the problems. Good luck.