Engine bucks until full warm. $3000 and 8 mechanics have not fixed it. I need a patient and rational mechanic.

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What has been done so far that you know of, both in testing and in parts replacement?
Is the check engine light on?

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1999 5.0/4R70W/4406 Ext. Cab

Welcome Phil, Glad you found us. Have fun and enjoy FRF. Hope someone helps to figure out your issue.
From Don
Grove City, Ohio.

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Myrtle: & Danna
1999 Ranger 4x4 3.0 Stepside Ext Cab XLT
2000 Mustang 4.6 Roush Supercharged ( Show Car )
1984 Elcamino 350 330 HP ( Nick's Show Car )
1959 Wife ( Arm Candy )
Danna passed away 5/26/2016

13 boxes of parts changed. Fuel pump, filter, fpr, coil pack, maf, plugs, plug wires, fuel pump relay,

Phil, welcome to FRF.

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2000 Ranger Extd Cab XLT, 4X4 Off Road, 4.0L, Auto, 8.8 - 4.10's, 01 grille & lights swap.
69 Mustang, modified 5.0, & 5spd.(project)
99 Explorer Sport, 4.0 SOHC, Auto, 8.8 - 4.10's, PW, PL, PM, Cruise, Tilt. (Wife's DD)
05 F-150 2WD Regular Cab. ( My DD)