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i had my 97 w 145k on it start running a little rough and missing on hot restarts, it was the injection pump o ring, now runs better, no hot start problems and starts better when its sat for a couple days, same thing only noticed it in the lower rpms over 2k just ran great
Where did the harness short out. Mine is rough under load and up to about 2000 RPM and it smooths out. It does seem to be variable about how much it "misses"
Sorry for the delay. I did not work on mine, took it to a mechanic to get fixed. He showed it to me and it was completely fried. I think if this is your problem it will get worse rapidly and then quit running completely.
Folks,
I have changed the clutch to the LUK with the flywheel replacement. Worth every penny and the truck is running smoother than I recall it running ever. I about put my foot through the floor board the first time I drove it. The clutch is worth the cost for drivability if nothing else. Fixed the vibration and works better than ever. Thanks to Carolina Clutch for their information and guidance.