Hello everyone. Newbie here. My engine starts and idles pretty good. I'm aware of 2+2 as my father has an 02 Merc 125. My problem is the higher end. It misses out and the rpm's won't hold steady. Sometimes it runs great for a sec but mostly pretty bad. I did find a few exhaust plate bolts by no. 4 cyl that we're loose. Not finger loose but not as tight. I know they should be at 18 ft lbs. Saw leakage from one of them. Any insight? Thanks