Got the car 1 month ago 2006 EVO9 MR 31,116 miles car stock except for swift R springs about 1 week ago SES came on car with rough idle but doesn't drop below 800rpm stays there actually though from start seems hard to go bogs even. I took car to shop. Got new plugs + 30k maintenance as well car was good no code idles slightly better also easier to drive. But today SES came on again and read same Cylinder 1 misfire idles same drives easy like after 30k maintenance. What could be wrong. Pleas help with advise. Thanks guys

 

Also did compression/leak down test
#1 135psi/4%. #2 140psi/5%. #3 140psi/5%.
#4 141psi/4%.

 

exhaust valves?

 

I made another appt same shop I went. They said they'll troubleshoot the problem.
^ I hope not ;(