03 ultra running rough

[chas]

i start 03 ultra up and it idles rough/skips then it continues for a few minutes then smoothes out, runs ok. I thought it was the plugs but I changes them out and its the same! Any thoughts? TIA

[Hossamania]

Is the air filter clean? Do the head breathers still feed into the throttle body? Has the throttle body been cleaned (assuming efi).
Start there.

[Bagger]

Add to list of things folks may suggest:
Replace fuel filter
In the tank, inspect "check valve hose" for pin holes which happen from rubbing on inside of tank.

[calif phil]

Engine temperature sensor.

[kd]

    Common, inconsistent symptoms which includes what is being reported and no code is present.  BTW are there any codes?

[Hossamania]

Add to list of things folks may suggest:
Replace fuel filter
In the tank, inspect "check valve hose" for pin holes which happen from rubbing on inside of tank.

Engine temperature sensor.

That, and that.

[chas]

Hi everyone- Thanks for responding. The engine temp sensor was replaced 4 yrs ago. Same with the fuel filter, and just a couple months ago the fuel pump was replaced along with the hoses. Air cleaner cleaned a couple months ago, engine vents externally in catch can. Here are the engine codes :TSSMU1 255 CUR HIST Missing message at Speedometer EFI  TSSM 01 6 CUR HIST Loss of ICM/ECM Serial Data Instruments. As reported by powervision