when i come up to a light or a stop sign... whenever i fully let go of the gas to make a complete stop the RPMs go down very far, below 500rpm and the car shakes as if its about to shut down then they go back up to about 700-800 and it idles fine. what da deal y0!

 

bump a lump like a lump you bump when u take a dump

 

YOU may wanna check your timing idle control on the screw thats on the throttlebody. Check you tune-up like uhh sparkplugs,fuelfilter,fuel pressure regulator and stuff like that.

 

explain this throttlebody screw thing, i just got new sparkplugs so its not those, maybe be one of the others

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by R3LL 1 &raquo;</TD></TR><TR><TD CLASS="quote">explain this throttlebody screw thing, i just got new sparkplugs so its not those, maybe be one of the others</TD></TR></TABLE>

on the tb, theres a screw facing the passenger side with like a really thin tape or rubber thing on it, turn it left and it opens it up, well u can always try cleaning your egr valves also...

 

I will say this again. Do not mess with the screw next to the throttle body. That is set at the factory for idle air bleed. If you mess with it, you can cause other problems with your idle quality. When you turn that screw, it in turn changes the Throttle Position sensor output signal. The PCM then may see a voltage reading that is out of range with idle voltage spec. The PCM then might try to "fuel cut" wich causes the engine to idle up and down at times. What you need to do is inspect the throttle body for "coking" or buildup of carbon deposits behind the throttle plate. If there is any at all, it can directly effect idle quality. Use Valvoline Syn Power throttle body/carb cleaner. Also use on old toothbrush to help scrub that sucker clean. Once it's cleaned out, start the engine and continue spraying the cleaner directly into the throttle body.Open the throttle quickly a few times to help suck all the nasties through the intake and ito the engine. Beware this can cause problems with cat. convertors and o2 sensors. At some point you will need to inspect the EGR passages in the intake manifold. To this, remove the long plate on the intake manifold, this directly behind the valve cover. The a large thin steel type gasket under the cover plate. Remove this also. You will now see four small holes in the intake manifold. remove the carbon deposits with the same stuff you used to clean the throttle body. reassemble and test drive. You will see some smoke from the tail pipe for a short time after serviceing the throttle body and EGR passages. If something here doesn't make sense, please let me know if you have any questions or comments. laterz-jfastman