2011 Nissan Sentra engine revs high, has a high pitched whine.
2011 Nissan Sentra engine revs high (3000-4000+ RPM) and there is a high pitched whine
when going up hill only. Last mechanic said it was a mass air flow sensor issue and
replaced it. Problem still occurs. If cruise control is being used RPM's will become very
erratic and the car will die when coming to a stop. What should I look at or replace to
correct this problem?