2000 dakota 4.7l. When started after sitting it makes noise like there is no oil in top of motor. sounds like valves chattering. last about a second. Motor never idles high when first started up no matter how cold it is. After warming up sometimes idles at 600rpms and is ok, then sometimes drops down to 500rpms. Also when I'm coming to a stop at about 7-8 mph the engine rpms rev about 200. does this everytime i come to a stop no matter how fast or slow i'm going. Have replaced tps, iac, pcv and taken throttle body off and cleaned.
 
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