stalling problems

[FONT=comic sans ms][COLOR=darkorange]i got a friend who has an 1992 integra Ls its got like 170000 miles on it. very clean engine looks like the person before it kept it mint. its an automatic but he having some problems when he goes to start off sometimes it will try to stall but dosent wanna stall. his check engine light only comes on when the car is revving high or something like that or when he drives it for a very long time. sometimes the car will even stall but start up perfectly fine if anybody has any opionion on this plz let me no. thx alot