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Sounds to me like a dual mass flywheel starting to let go... I had exactly how you describe it, a shudder under load.... performed cylinder balance test, checked wiring harnesses, changed those and valve cover gaskets.... turns out it was the dual mass flywheel. Pull the inspection plate off bell housing and you shouldn't be able to move the clutch back and forth too much.... there may be debris in there aswell (ball bearings etc if it has come apart). Replacement with a single mass flywheel is your cheapest and best option. Let me know if this helped.
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96 FORD SUPERCAB, 5"LIFT, 315 BFG M/T'S, 10 000LB WARN WINCH, BUSH BUMPER, GUTTED EBPV, K&n AIR INTAKE, OPEN EXHAUST AFTER DOWNPIPE, WAITIN FOR $$ FOR MORE MODS.
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