Changed the plugs to F8DC4 Bosch copper non resistor and the springs under the coils. Here's what I notice now. Turn the key to on for a second, start, runs smooth for 3 or 4 seconds then resumes missing. It does this every time I repeat the procedure.

The car runs fine at high load (full throttle up a hill). It doesn't bog down but of course still misses.

No fresh codes with one test drive.

I wouldn't think it's a wires, plugs, harness problem since it will run smooth at startup then starts missing after 3 to 4 seconds everytime.

Where else do I look. I'm not a gasoline MB man so I'm clueless!
thanks!

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-F250 '96 7.3
-Dodge Ram 12V
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Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.