I have 1997 SE, a year ago a mechanic screwed up my car, long story short, I now have an engine from a 1998 GLE, but I can feel significant power loss. Anything I need to take off of it, i.e. a limiter or something?

 

any ecu codes?

 

no

i slapped on all the same mods too: Frankencar, K&N pop, Y-pipe

 

maybe the knock sensor is dead on hte new engine, check for a "ghost" code 0304