a failing oxygen sensor can also cause a car to run rough while idling, but it wont affect the car while driving. Sometimes, vacuum lines cause a rough idle due to a vacuum leak, and these lines are also simple to replace. A common cause of an engine running rough is faulty ignition timing. todays 3 minute thursday we talk all about lawn mowers running rough. Hope you enjoyed the tip! Dont forget to subscribe! --- items i recommend cheap trimm. A broad range of problems can cause rough idling in a motorcycle engine. A problem with fuel delivery, spark plug operation or metering of the air-fuel charge can cause problems at idle that may not be obvious at higher rpm ranges. Motorcycle manufacturer recommendations vary, but most issues can be isolated using a. 2000 toyota camry le v6 when i first start my car it runs rough after about 5 to 10 minutes it runs fine. I used sea foam and the problem went away for a couple weeks then it came back. Discussion in softail models started by bcortani, sep 29, 2012. Hi all, first, i have an 08 heritage softail classic with basic stage 1 with dobec gen3. Last summer i was in seaside or and she got really hot and started running rough and was. this 2005 ford truck has the classic lean dtcs p0171 and p0174. Idle is rough and vibrates quite a bit, runs good under acceleration although it does lag a little if you have to get. Find the most common driver-reported problems that are to blame when a chrysler pt cruiser has a rough idle.