2009 GS cutting out on hot days

[Photoman]

i have had to live with this problem for some time now runs perfect on cold days and cold mornings but when it starts to get hot 4 to 5 bars the GS will start missing real bad a low RPM in city trafic where i cant wind it out to higher RPMS it will clear it self at higher RPMs like 5000 and above if i just hold the throttle at a high RPM
i have replaced the exhaust gaskets the coil and gas cap and the O2 sensor
I have two brothers exharst twins dealer seems to be clueless.

[billybovine]

The OE spark plug wires are not very good. Have they ever been replaced?

Maybe cracked vacuum lines to the MAP sensors. They should have been replaced by now?

[Chupaca]

your vacuum lines will heat up and let air in check and replace if needed. Some have put zip ties to keep them tight. Spark plugs and wires are another problem. Fuel filter and air cleaner. Hope it is simple but let us know if you find the problem...

[Kwalsh]

i wish i could help you but we havent had any warm weather here so i am not familiar with it

[NexVision]

I had the exact same problem with my 08 GS and it was the spark plug wires. They actually fell apart when I removed them got my new ones from Ron and have never had that problem since.