Stumble from stop light under mid to heavy throttle

[ewebby]

Symptoms: seems like the engine is missing occasionally on cold start, when in gear, seems to loose power in high torque starting situations like a hard turn from a stop or taking off from stop.

New development. When I filled up the tank, the issue seemed to go away.
Could be
Less ethanol in my latest fill up?
or
Fuel pressure issue caused by fuel pump, which is 35k old.
or
I have had an issue with the fuel level sensor - it stopped working after a refill a few months ago, worked a few days later, I supposed it was near empty for too long and got stuck / old.

Could be totally not related though

Recent repairs.
I replaced transfer case and shaft, new Giubos front and back, new bolts and nuts, new Transfer case fluid.

Next step
Bought a new fuel level sending unit (drivers side) and perhaps the existing one connection is bad or worn after 261k or the sending unit is not picking up or partially clogged when low fuel?


Bought new coils and plugs to be installed

Could be bad Transfer case but it was rebuilt from a reputable place and the 1 inch longer shaft would not slip when both shaft and TC are new.

[X5chemist]

From YouTube Nathan's Garage, bad coil packs may not give engine codes. It's a good place to start.

[ewebby]

Update
Turns out one of the coils had a gap due to a rubber spark plug socket breaking off down in the spark plug hole and keeping the coil from seating. I will never use those rubber sockets again, will use magnetic.
I replaced all coils and plugs with Ruthenium HX NGK plugs. Runs flawlessly. So for 24k miles the car intermittently missed on cylinder 3. I had swapped coils as I got a code, and have gotten random P codes for misfire, FINALLY FIXED!

[X5chemist]

Nice find. I went to magnetic 16mm sockets for overhead cam engines. Two extension lengths. Plus one deep socket. A combo set is cheap on Amazon. You'll like the HX NGK plugs. I installed some with new coil packs.