91 W124 has a intermittent rough idle some times I can gentle quick spike the throttle and it will return to a smooth idle until the next time I come to a stop. initially this was most noticeable in gear stopped at idle now it seems to be more noticeable even in nuetral and now the throttle spike seldom smooths it out. the car has 195k on it. Unsure what may be causing this. To clarify the idle quality is not major shake like I have seen in an 84 603.
Last detail that may be related is. My power output is actually better than it usually is and I am having temp issues under load ( the temp issues have existed on and off for the last few years so am unsure it is related),