Michael Price said: (quoted from post at 18:54:30 06/18/08) I took my 484 down the road and at full throttle it ran fine then started to drop a few rpm real fast. Then it would go back up a little then drop more. It runs fine at idle or pretty much any rpm it just did this at full throttle going down the road.
Any ideas what causes this? I also noticed some bubbles in the injector return lines.
Air in the fuel. You have a leak somewhere between the tank and the injection pump. Depending upon where it is it may not be leaking fuel but the pump is drawing in air some place.
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