hi. so my 91 9000 has developed a weird idle.
what i mean by this is i will start it up, idles fine. say i drive it to the store or just do afew pulls on the road. once ive been driving for awhile and get to 1st gear doing say 5-10mph. then the car will idle like crap instead of 850rpm. it will down say boucning around between 500-600rpm.
if i turn the car off then back on it idle beautifully. its really weird. its done this three consecutive times so far. runs very well i might add.
im thinking the IAC valve is faulty or needs a cleaning. anyone agree?
thanks in advance.