I have a 2007 Ford Mustang GT. It seems to run great with no noticeable problems. I have a check engine light on giving me the codes p0174 and p0171 meaning bank 1 and 2 are lean. But my problem is when driving the car doesn’t sputter or hesitate, no ticking, no misfires. When I slow down for example from 45 to 0, or when letting of the gas pedal when coasting down a hill without hitting my brakes. My cars RPM start going up and down and typically will just continue to drop until it dies. And it will start right back up immediately. And it also seems to only do it once the temperature gauge is in the middle. Don’t know what’s the issue. I’ve replaced several things myself. Throttle body, pcv tube, fuel filter, Mass airflow sensor, and the air filter. The car also has an aftermarket JLT air intake. In my case for the lean codes it could be caused by a variety of things. Just thought maybe a few ideas could help. Thank you.
What makes this problem better or worse?
When the engine gets warm
How long has your 2007 Ford Mustang had this problem?
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