and your dealer couldnt figure it out after 20x in the shop?
I dont have, "EFI" Mine is carb,but i will try and blow everthing out,my choke was just fine.EFI . i would bet there is something in the fuel tank /lines , some kind of restriction!!! Drain your fuel tank ..blow all the lines out (disconnected) backwards , lil spirts of air . really look closely at the fuel coming out of the lines... i would even do this whole procedure 2 times .. (meaning putting all fuel back in / lines hooked up etc . then drain everything ....etc ...blowing everything out . And don't miss not even 1 line .... you just may be surprised. The smallest lil foriegn object in an FI application with screw up the whole fuel system. I'm sure they have check fuel pump prssure and all that . Good Luck