I have recently had the top end rebuilt on 2001 FXSTI 88 cu in. I presume bike is stock except for vance and hines staggered shots. Engine had lifter noise and was found to have heavy carbon buildup. Heads and pistons were cleaned, new rings, valve job, new lifters and rocker arm bushings, and had all cam bearings replaced. Idle sounds like a bracket racer car. Accelaration is very strong under throttle. While cruising @ 20 in 2nd, 30 in 3rd, 40 in 4th, engine has big cam lope sound and bike seems to stumble or possibly surge. While cruising on highway @55 or so bike acts like electrical will shutoff and back on for only a split second. I will also advise my turn signals flash 6 times when being started. Code by flashing turn signals says 31. Bike has no alarm. Please advise.