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check the fuel pump and related electrical system and fuses. The aveo doesn't have a fuel filter but only a screen at the bottom of the pump. I had to replace the fuel pump in my 2004 aveo at 80k due to a clogged screen. Hope this helps
Check the fuel filter first, it might need changing. This is the cheapest and easiest thing to try first. If it doesn't help, then it's probably a more expensive fix, like a fuel sending unit. Good luck!
There is a Communication problem between the Transmission Control Module (TCM) and the Engine control module. That is the bad news and is why it's shutting down the engine.
The good news is i believe there is a TSB recall on the 2004 - 2007 chevy aveo for the P0700 problem so it should be covered under warranty.
Believe the TSB# 05-06-01-030D
Good luck and hope this helps and hope it's not a bad ECM. Check the wire harness to the ECM and TCM, look for broken wire or the harness it self gone apart.
i gust put a head on a aveo the only fuel filter is on the back of the motor it haves a lectrical plug on it its on the brase that holds the intake to the motar the only way to see it is to get under neth of it.
try giving your car a simple service, change oil, oil filter, air filter, plugs and leads etc. also get your wheels aligned and balanced as having bad geo can also be bad for fuel consumption. if that doesnt work then id recomend a garage.