I have a 2.5 pro 4 motor that stutters and stumbles all of the time. It does it at low and high RMPS and it does it much worse under a load. We have changed the fuel system carb-hoses-filters-cell, wiring, distributor, lifters, valve springs, intake, head, and I am sure more that i am forgetting. Does anyone have any idea what we could be missing?
Please let me Know what you thinks Thanks
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