Q: I have a Harley cold start problem with the used 2008 Road Glide that I bought. When I start it up in the morning it starts right up and goes to 2000 rpms. Then almost immediately drops to around 1000 rpms. Seems like it is almost going to stall out, but it doesn’t, and then it goes back up to about 1500 rpms. Is it something to do with the TPS? When it’s idling while it’s in gear it idles at about 1000 rpms and vibrates the heck out of everything. I want it to idle smoothly and at a higher rpm.
A: Check your speedo for codes. There is a good chance that you have a bad throttle position sensor, idle air control sensor, maybe even engine temp or map sensor. Would be nice if you could get your computer to tell you before spending $. Also, you should check for an intake leak.