Check to make sure you didn't accidentally displace any vacuum lines while you where under the hood. You should hpbe able to hear a leak large enough to raise the idle that high.
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SOURCE: Engine oil light 2004 durango
sounds like you have a bad connection to the oil pressure sending unit or the sending unit itself is bad. look for a loose connection and if it's ok just replace the sending unit.
SOURCE: car stopped running on highway and wouldn't
you should check engine compression if you can. its possible you have a bent valve.
SOURCE: Change the oil on a 2000 Dodge Caravan
Jack up pass side.Put cardboard, BIG piece under engine just in case. Using a pan to drain the oil in put under oil pan drain plug. Remove drain plug with socket wrench. Let drain 5 min. Check the gasket on the drain plug, if bad replace with new gasket .99 cents to replace gasket only on plug. Put plug back in DO NOT OVER TIGHTEN the plug. Slide drain pan with drained oil to the front to remove oil filter. Using a filter wrench remove oil filter. Let drain. When installing new filter put a little new engine oil on the rubber gasket on the filter with your finger. Screw filter back on tighten with filter wrench. Fill van with oil from front valve cover opening.
SOURCE: why will my 2000 dodge 1500 truck start and idle
then the normal suspects are...
IAT (intake air temp) sensor
IAC (idle air control) motor
dirty/corroded connections
do you see any specific weather conditions before/during the idle concern like cold and/or rain?
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