Expedition will shake when accelerating

[gaboy1965]

Drives fine but when it experiences any load it will start to shake and stutter.

No engine light.

How do I diagnose.

Most like coil packs or plugs but not sure how to figure out which one.

 

[Motorcity muscle]

Can find several post here with the search function, best guess plugs, coil should trigger a CEL.

 

[gaboy1965]

Just replaced all plugs less than a year ago but maybe I got a bad one or two.

 

[Mike Expy Poland]

connect - even a forscan - and read PID data while you accelerate and it will give you more answers than the forum when you ask general questions. it could even be a partly clogged fuel pump, or fuel filter, or anything else reacting bad under load. but first and foremost - do diagnostics under load. then once you have some ideas, check wiring where it is pointing you too, sensors as well.