What Causes Cars to Idle Low?

Answer

There are a few reasons that may cause cars to idle at low levels. One reason may be because the idle level is not set correctly. A couple of other reasons may include a low fuel pressure or low oil pressure.
Q&A Related to "What Causes Cars to Idle Low?"
Ultimately, any kind of rough running is de facto evidence of some kind of misfire - if there were no misfire, the engine wouldn't run roughly. Misfires come in two varieties: dead
http://www.ehow.com/list_6107077_causes-rough-idli...
could be alot of things from a vacuum leak to a IAC (idle air control) module the type of car is very helpful.
http://wiki.answers.com/Q/What_causes_low_idle
check and clean the idle air control valve. that could resolve the shole issue.
http://answers.yahoo.com/question/index?qid=201107...
Bobby: You took the car in to a shop and had something fixed on it. The car ran fine before it went into the shop but will not ran or idle very good. Take it back to the shop and
http://en.allexperts.com/q/Mitsubishi-Repair-824/2...
1 Additional Answer
Cars that idle low tend to shake frequently and even stall when the brakes are applied. Possible causes include a vacuum leak, a fault in the computerized engine system, or broken linkage. First check and replace the vacuum lines to rule out a leak. Then use a scan tool to check the computerized engine system. After testing the circuits, replace the necessary components. If the problem is a broken linkage, it will have to be repaired or replaced.

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