1998 Honda Civic EK B18C4 high idle when start up?

I recently purchased a Honda Civic with B18C4 engine swapped in and everytime I start it up, the rpm needle shoots to 2k for about 5-8 seconds then goes back down 1k but the engine misfires. What can I do to fix this?

You made several mistakes when you purchased such a fine automobile…(1) did you have a mechanic do an inspection of all components before purchase? (2) did you get all written maintenance records from the previous owner? (3) is it even legal where you live to have a vehicle with an engine that is not the OEM engine? ( many States now have laws where so called engine swaps are now illegal, and the vehicle can't be sold with a different engine than the OEM )… Since you made all of those mistakes, you are now finding out that you should not have purchased that heap, and now you need a mechanic to do the inspection of at least the engine to diagnose the problem and give you the not - so- good - news about repairs, if even possible

(PS - not to be harsh ; but many young people do exactly what you did, then they have problems with the vehicle, and want to find a way out…)

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