Hey guys i've got an 89 190e 2.6 5spd that i've had for a few years now. I bought it not running (rotor hat was busted). I replaced the cap and rotor, new plugs (non resistor) and wires. Ive always had some low rpm stumbling. Not all the time but just at random moments. Sometimes it'll stumble and lately ive started to hear a backfire from the ignition side. When i first start it it'll fire up no problem at all but it's pretty rough for a moment til it smooths out. I've replaced many items and it has honestly ran pretty well otherwise. Seems to have decent power for what it is. Since the other day though i have no power once i go further than half throttle. It just kinda bogs down it seems. Very slow acceleration and it's not really driveable at this point. I'm hoping somebody can point me in the right direction?

parts i've replaced since i put it back on the road:

-rotor and cap
-wires
-plugs
-o2 sensor
-ovp relay
-iac valve
-coolant temp sensor
-fuel pumps and filter
-vacuum lines and intake hoses

A lot of this was kind of guessing and throwing parts at it but i also figure it would be good to go ahead and do basic maintenance for the future since a lot of it seemed original.

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99' ML320
03' C32 AMG
89' 190e