I recently bought a 92 astro 18fdx. The I'd tag on the motor reads 150etlk. The cowl reads 150 pro v. The carburetor have 200hp stamps aka 6g605 and jets in them. The power is stamped with 6g500. All the research I've done leads me to believe that someone put a 200hp powerhead on a 150 mid and lower and changed the cowl. So my question is this. What do I do to make it run correct. To start it had dirty carbs and a bad fuel pump. I rebuilt both. I also did a link and sync on it, but did so under 150hp specs. Now it will finally plane out but stutters at mid and surges a bit at high. Would the timing being a bit off cause this? Should i make sure it's jetting for 200hp jets. I'm scratching my head and don't know where to start. TIA for all the help. Is this something Ray could help me with,?