It is hard to give you a response over the internet without examining you in person and reviewing your data but I will try to give you some helpful information.
Palpitations is a very non-specific term which can be due to multiple causes. A lot of times, they may not be associated with a blocked coronary arteries or even to the stent that you got.
I would advise you to discuss this with your cardiologist. A Holter monitor might be of particular benefit in your case. This monitor helps record your heart rhythm for 24-48 hours and will help delineate out your heart rhythm, when you are having symptoms.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.