>>> UPDATE <<<
I just discovered that the car is throwing both P0171 and P0174, so updated recommendations are welome.
My mom’s 1999 ford Taurus 3.0L 4V is throwing a P0171 code.
Lots of info online about that but I have seen nothing regarding my below question.
So, I am wondering…
Of all the different things that can cause this, does the fact that when you first start the car it surges to about 1500 to 2000 RPM for about 10 to 15 seconds then idles down and runs like crap tend to lead you guys in a certain direction? (not sure about warm or cold startup)
Any ideas about this? Or… if you were working on this car, in what order of possible causes would you begin to check for the issue?
PS - A bit of smoke coming out from in-between firewall and back of engine. Smells like burning oil but I checked oil level and it was full. My mom is 85 and rarely checks anything or has any kind of maintenance done.