1998 Isuzu Trooper 3.5L, V-6 mileage: 62,000. After cruising 100+ miles on the highway using the cruise control, I slow down at a traffic light and the car stalls. It restarts without problem but the idle is poor and sometimes quits. This morning the car started great, but after I came out of the store and restarted, it would not idle unless I pump the gas or maintained RPM\'s above 1000. Made it home and checked all hoses and connections and started ok with good idle. Is this an IAC valve problem?