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Yea I'm thinking at this point it's time to replace the injectors. Water in the fuel may have been the straw that broke the camel's back. After all, they are at least 20 years old. You really can't go by mileage with a Humvee. They may have spent a lot of time in the woods in low gear. Where it...

A ten mile run probally used about a gallon. Do you have a laser thermometer? You can check each exhaust port to see if any of them are running cooler at idle. If so, you may have a dribbling injector. If it was full on sticking the engine would have a miss. As a last ditch before you pull...

You would need to have more that one sticking injector to keep the engine from getting above 1300 at WOT. And the white cloud coming from the exhaust would be epic. It would not be drivable if it couldn't get above 1300 in netural. If you haven't drove it since you replaced the fuel, I would bet...

How does it run while driving? If you had water in the other fuel. Try driving it with the fresh fuel and see if it clears up.

Did any water come out of the filter when you drained it? If so let it sit over night. Enough time for the water to settle to the bottom of the fuel tank. There is a small black drain on the bottom of the fuel tank. Drain the water off there. If this is the case replace the fuel filter and...