i have a 92 sentra it has a 1600 cc engine and its fuel injected. it dies when i come to a stop. as long as i keep the rpm up it runs fine. last year i put in a new battery and a couple months ago the alternator went out so i put in a used one. about six months ago it would die ocasionaly, but now it dies every stop which makes it impossible to go to work. can anyone help me?