If RPMs vary even while idling, sounds like mass airflow sensor is bad, but there are various things that can cause the rpm to be inconsistent. Vacuum leak, idle control valve, throttle sensor etc
Any codes? clean throttle body air filter, TPS sensor, IAC sensor.
Testimonial: "No codes and the surging occurs between 1st and 2nd and 2nd and 3rd gear not at idle."
SOURCE: pontiac montana turn signal flashing too fast
At:
http://townhall-talk.edmunds.com/direct/view/.f101976
found this discussion which might be helpful:
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No surprise at all! Common problem which has been discussed several times on this site.
Basically.....tail light(s) plugs (Pig Tails) were sub-standard and cannot stand the heat of the bulbs. Pull out hear tail light fixtures, remove bulbs from recepticals and check for melting plastic, usually between the black wire (hot wire) and one or more colored wires. If so, cut out old Pig Tail, get a replacement Pig Tail, soder it in (I think about 6 wires), and use electrical shrink wrap around sodered joint, install new bulbs using Di-electric grease in the socket. Test before reinstalling light fixture.
Jack
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The poster also mentioned something I forgot; use some kind of grease in the sockets any time you have reason to access them.
The dielectric grease he mentioned is best but if you can't find (it is and electronic item, rather than electrical), even petroleum jelly will afford some protection.
I use it on battery clamps and it helps ****** the typical corrosion.
Since most cars use the chassis for ground, even the fasteners that hold in lighting assemblies can lose contact so I always loosen, then retighten them, to ensure decent ground contact.
Check too for corrosion in the light sockets themselves.
Dunno why it is so tough to seal a compartment but our US manufacturers can't seem to get it right.
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SOURCE: replace thermostat 2003 pontiac montana
yes but with the right shaped wrenches and tiny hands it can be done without removing the exhaust crossover pipe
SOURCE: how to put out the radio in montana 2003
there are 4 screws. two in the front behind the cup holder and two up underneath in the cupholder bay after the cupholder is removed. they are phillips head and 8mm I believe. this is all you need to remove the cover.
SOURCE: 2003 Pontiac Montana Front Wheel Bearings
Remove the wheel, remove the hub nut, remove the brake caliper and rotor, put your socket and extension through the hub flange onto the bearing retainer bolts, undo them, release the abs sensor connector if it has it, remove the bearing and hub flange as an assembly, put the new one on and go backwards from here. Torque the hub nut to 180 ft/lbs, your done.
SOURCE: 2003 pontiac montana leaks condensate water in the drivers floor
Bet the drain is clogged with leaves. Look under the blower motor under the hood. Can almost be that the cowling has been filled with leaves at one time or another. Got to clean that stuff out every now and then.
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