Hi,

My '91 Montero LS all of a sudden starting idling way too low and last night it even stalled out at one point but I was able to start it back up ok. There is plenty of gas in the tank. It has 155k but has not had the o2 senors or pcv valve(s?) replaced. Could these be the cause? If not, what do you think it could be?

Thanks,

Andrew
S.A. Texas