I have a 1993 240 that I just finished swapping a m47 into. I finished and I started it up and noticed it was barely keeping a steady idle and would either start to die when I revved it or rev no further than what sounded like 2000 rpm (my gauge cluster doesn't have a tach) and would just sit there unsteadily. I checked the throttle body was all good and the maf is clean, also lit an incense and ran it around the vaccuum lines to see if there were any leaks and nothing. Was wondering if this sounded familiar to anyone or if anyone had idea on what to test, thanks!