04 sportster LE DI dies when throttling down

[jjbauer81]

My boat will start fine, it will idle, and it will throttle up fine, but as soon as I back the throttle down to less than 2000 rpms, it dies. Even if I throttle up quickly before it dies, it does not keep it from dying. When I try to start it again, it will fire up and die and repeat this a few times before it starts back up again. And then the process starts over. It'll throttle up fine, but as soon as I throttle down, it dies. I put brand new plugs in it and it didn't help. I even drained the fuel tank and put in brand new gas, and it didn't help. Any ideas?

 

[Dr Honda]

Unfortunately, when the injected engines have issues, it's hard to fugue out, without the dealers computer. But, I would make sure your fuel pressure is staying up, after a run. Also, I would check the TPS.