[DMCForum] Engine running half rich half lean.
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[DMCForum] Engine running half rich half lean.

This is a unique problem.  When I start my car now, the engine will run half lean and half rich.  The driver's side (4,5,6) all run rich (spark plugs are charcoal colored), and the passenger side (1,2,3) are lean.  The mixture screw has been adjusted properly, and these sparkplugs have been replaced recently.  I assume the fuel distributor sends fuel out equally, so I'm pretty sure the problem doesn't lie there.  Could it be dirty/faulty fuel injectors?  I'm kind of lost on this one.  
   The car does something else unusual.  The engine will idle fine when cold, but as the car warms up, the idling becomes very erradic.  It will "jump" around when in drive or park.  Don't get this confused with high idling or idling up and down in a cyclic motion - this idling goes fast then slow and repeats this pattern very rapidly.  It's very uneven and just all over the place.  It almost sounds like the car will literally die when sitting at a stop light or a traffic light.  When this idling problem occurs, I get alot of "spitting and sputtering" when going from a dead stop to acceleration.  After it spits and sputters for about 3 seconds, I get a sudden burst of acceleration (almost as if one of the cylinders isn't opening, and then WHAM! it opens all of a sudden)  The car will do this generally around the time the cooling fans on for the first time, and then after about 10 minutes the idling is perfectly normal.  When the idling is normal, there is no more "spit and sputter"
 either; the car runs completely normally.  Any ideas anyone?

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