I currently have my '96 Isuzu Rodeo in the shop right now getting fixed
for bad idling (i.e. sometimes would stall when coming to a stop or
sometimes idling too high when coming to a stop). I too have had issues
starting it in the morning and it sounding very odd. What I usually do
is rev the RPMs to about 2k until the rough idling turns to a nice hum.
What my mechanic had just told me was that the Idle Air Control motor
grinds (part costs approx. $48). Since it's grinding due to possible
suit and/or carbon build up, changing it could cause some of that
carbon or suit to get back into the fuel system, so their going to do a
fuel system flush (approx. $120). Since they're doing that, they said
they might as well change the fuel filter as well (part costs approx.
$14). Labor, in my area, to do all this is approx. $80-$90, plus they
have to charge me for figuring out the problem (approx. $82). Throw in
tax and i'm looking at close to $400. I think I can probably get away
with the fuel system flush by just putting some Red Line injector
cleaner into the gas tank, but I guess since I have the money, might as
well get it all done.
So you could have your mechanic take a look at your Idle Air Control
motor (or even the valve) to make sure it's working (or opening and
I'd like to know the outcome too, because it happens far too often that
these threads get created and problems asked to be solved, but no one
takes the time (once said problem is solved) to come back and report
the possible fix turned into the absolute fix.
Thanks & Good Luck,