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I don't know how to upload a video or would.

Start car it sounds good and strong.

About a min in while parked the rpm is at 1000 idle..

Then it starts to go from 1k rpm to 1,100 rpm

It does this steady for a couple minutes then it goes..

From 1k to 1,000 rpm dips down to about 900 ... that is maybe a second to do that then stays like that consistently..

Should I be worried

I don't know how to upload a video or would. Start car it sounds good and strong. About a min in while parked the rpm is at 1000 idle.. Then it starts to go from 1k rpm to 1,100 rpm It does this steady for a couple minutes then it goes.. From 1k to 1,000 rpm dips down to about 900 ... that is maybe a second to do that then stays like that consistently.. Should I be worried

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[–] • 0 pt

not really. Get a can of spray carb cleaner and with the motor running spray some along both sided of the intake manifold and if the rpm's increase you found the vacuum leak. CAUTION the carb cleaner is highly flammable so stay away from very hot or open flames. Since it is a used engine it is likely the intake manifold bolts got loose during pulling. The intakes are also plastic so may be a crack. Need anymore help just let me know,

WWG1WGA

[–] • 0 pt

use WD40 then dont have to worry about flammability/

[–] • 0 pt

good Idea

[–] • 0 pt

Well its the opposite with WD40 now that I think of it. WD40 will seal vacuum leaks momentarily and cause a high RPM to lower to normal. While I think the carb cleaner leaks in and burns causing RPMs to rise. Either way will work though.