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No codes thats why I am trying to put some miles on it so A code will come up.

If I end up having to go the the dealership I will only have them update the maps on the ECU thats it. I have been driving for 400 miles and it does it every other day sometimes it bucks the whole way and other times it is every now and then. Damn pain in the ass. I am going to get the wiringing...

New EGR , I am waiting for a code , last was crank shaft pos sensor.. read that was false code..ECU learing. I am going to switch out wiring harness then tackle ECU , how much does dealership charge remap or update on ECU

Same problem, used engine , diff coil, new fuel filter, new wires and plugs, new fuel pump and fuel sensor. Any help plz

all replaced, never had this.

I have a 97 Ranger had everything replaced , used 4.0 v6 2wd , only thing original is wiring harness and ECU , bought new coil swaped still bucking at 2.5-3000 RPM. Has anyone had this problem ? I am new to the forum, not new to Rangers had many never this problem , I replaced engine now at a...