I have a 2001 Nissan Maxima SE with 62000 miles. When I am sitting at a stop it idles fine but while I am driving and step on the gas it revs to about 3500 rpm's then kicks in and accelerates. I have been told that this year of Maxima has problems with engine coils and I have a few in the trunk from the previous owner. Is this the problem? If it is, is there a way to test to see if any are still good?