I went searching for a sensor Sunday to find when I took the part #and Googled it lots of later sportsters and big twins use the same one and the king of on line sales got me one here Wednesday for about $25.
34nineteen mine also acted strange high idle like not warmed up an not as smooth as normal shut down cleaned sensor and it worked for 2.5 miles I haven't put the new one in I will tonight. It only acts up when up to temp for a while cold in the AM went 30miles this morning and worked fine
