Surging need help !!

[VA-hawk]

I got a 99 with pc3, full yosh rs3 and airbox mod. I did the airbox mod about 2 weeks ago and ran ok considering I need to retune the bike but now for the last few days its surging at a steady speed at any rpm, if you twist the gas and the bike pulls the surging goes away. I tested the tps sensor and with the bike at idle the - is centered on c00 so that's good. and all the vac lines are good. Is there any other sensors that could cause this issue or do I need to be looking at a fuel pump and regulator.. I need help... lease:


Thanks

 

[rubbersidedown]

Are you still running that crummy stock fuel pump?

 

[VA-hawk]

yes fuel pump is stock. At wot there is no surging. didn't think it would be the problem..

 

[rubbersidedown]

At wot there is no surging....

I have no idea what that ^ means.

RSD.

 

[VA-hawk]

At wot there is no surging....

I have no idea what that ^ means.

RSD.

when bike is accelerating I cant feel the bike surging. only at a steady speed does it surge.