westcoastgrandnational
Member
- Joined
- May 28, 2014
hey guys i have a 90k original mile 87 grand national which appears to be 100% stock and when its at idle in Park, the motor seems like it has a tiny miss, engine shakes a tiny bit, is this normal for grand nationals? Ive heard alot of them do that, heres what ive changed and checked for, new spark plugs, new sending unit, new fuel pump, new fuel filter, new idle air control valve, cleaned the mass airflow sensor, and have checked for vacuum leaks already.