I have a Dodge Grand Caravan 2001 that was having running rough and the exhaust smelled like raw gas. I replaced some sensors and that didn't work so I decided to replace the ECU. I got a new ECU from FlagshipOne and put it in and now the car won't turn over at all. I put the old ECU back in and get the same result. What should I check now?
Also, the battery is not an issue. I charged it up and nothing changed.
Update: I waited a little bit and then tried starting the car again with the old ECU. It started up but still had the rough idle, etc... So I put the new ECU in, waited, but it still will not turn over with the new ECU. I can hear the fuel pump run and I can get the live sensor data with a OBDII tool but it still won't start.