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Hello all,


I got a 2003 Z1000 about a year ago with 2,500 miles on it. In the past year I put about 7,000 miles on it with little problem.


But recently is started to hesitate at highway speeds, feeling like it was running out of gas. I can't guarantee it, but it seems like when I filled the tank up, or possibly just opened the tank, that the situation would improve.


I took it to a shop, explained the issue, and they told me they couldn't find anything wrong with it. They did say they drained the tank and cleaned the lines, and recommended gum-out.
Riding home from the shop, I hot about 50MPH and it started to happen again. This time it seemed like any time I went above about 5500RPM it would happen. I pulled over once, opened and closed the tank, and just revved the engine to about 8000RPM, and in a few seconds it started to sputter and dropped down to about 2000RPM on it's own (throttle was still at same position that had been 8,000RPM).


I don't really want to go back to the shop and might try to go it on my own. Any advice on where to start?
 

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I would check connections on the coils. if you can, check fuel pressure if its low or dropping when it happens fuel pump may be on the way out or the fuel filter is restricted. Hard diagnosing things without being there
 
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