Strange engine stumble / intermittent stalling

[speedyspaghetti]

Hi everyone -

I'm having some trouble with my 2016 Fiesta ST that I need some help diagnosing.

For about two weeks now, the car has been intermittently stumbling where it feels like the engine is getting no fuel at all (or spark or air or something but basically there is 0 throttle response).

The problem manifests itself in two ways:

1. A few times (probably about 5 times) right after I start the car, it'll drive like 50 feet and then just completely shut off. Basically it just stalls and I have to restart it. No check engine light or stored codes - just completely dead. Once I turn it back on, it works fine.
2. More recently, it has been stumbling every few moments when at highway speed. The car won't shut off, but basically the accelerator pedals becomes useless for a second or two and then it comes back to normal after doing a stumble / lurch sort of thing. Again, no CEL.

Any ideas where I should start looking? Spark plugs were replaced last year with NGKs, engine air filter is new, maintenance has been kept up well. About 100k on the dash.

Thanks everyone.

 

[TyphoonFiST]

Throttle Body* It is electronic you can buy them off amazon for like $60-70* Or its the LPFS/ Low Pressure Fuel Sensor starting to fail.

 

[Sam4]

Throttle Body* It is electronic you can buy them off amazon for like $60-70* Or its the LPFS/ Low Pressure Fuel Sensor starting to fail.

please don't stop reading the Forum daily - this is why we're here!

 

[scooter123]

Check your battery connections. A loose connection can cause intermittent interruptions in power for the fuel pump and that will result in a stall or stumble.