09 cobalt bogs down, stalls, bad fuel economy

al3xjc

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I have an 09 cobalt LS, my car is throwing P3000 (CAN data bus, instrumentation - glow plug warning), P0401 (Exhaust Gas recirculation flow insufficient), and a P0128 (Coolant Thermostat, temp below regulating temp) Just repaired a very cracked flex pipe and o2 sensors. When "cold" started it will sometimes stall out, if I clear the codes the RPM's will bounce from 900 down then back up a few times and catch itself but will sometimes just stall out instead of catching itself. I also use to get 30 MPG now get 18! ANY help or ideas is appreciated! Thanks!
 

BGreen

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Apr 1, 2020
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Stuck open EGR valve? I've been told if it stuck open it could cause bad idle and mpg drops.
 

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