2000 Daewoo Leganza "rising falling engine idle" Questions

Engine problem idle speed rpm rises and falls from 2500-2000 in park, but is at 1500rpm when in drive. Hi goodafternoon, I think the problem is your thermostat is bad, because I had similar issue that

...rising and falling as my 1.6l idles the idle rises and falls on a steady rate. What causes the problem and what should i do to remedy the problem? Check for a vacumm leak from the air filter over to ...

...compensate, you may also hear a hissing noise when the idle fluctuates, that would be a vacuum leak. If your check engine light is on, have the code pulled and it may point you in the right

...idle speed is coolant temp controlled. when the engine idles up the electronic coolant temp sensor is submerged in coolant and reads warm, so the engine computer idles the car down. the coolant level ...

Engine surges (idles high with rises and falls) at times. Not always. It could be a MAP sensor or the idle control sensor.

...rising and falling idle The engine fast idles normally but as soon as engine is warm it climbs to 2000 rpm then drops 1000. And then right back up again, up, down continually. As soon the automatic ...

...idle air control; shoot some of the cleaner in there. The engine may stall while doing this, but restart the engine and repeat a few times. After that, turn the key off and disconnect both battery ...

...the throttle body idle lever can wear out causing cars rpm to drop-chec gauge to confirm-wil be around 500------also motor mounts wear-need to test using emergency brake and watchn engine rise n ...

...engine will heat up, gauge will hit half way mark then drop. after that the gauge will rise and fall about every 3-5 mins from the 1/4 mark and down when you are going about 80+kms, when in park and ...

...engine running at idle and gear shift at park car runs good now gear shift moves to drive engine begins to surge that is rise and fall of rpm to a point after repeating this motion for about 5 to 6 ...