Finally got the new chain tensioner in. Engine still runs like crap. It acts like it's missing, but I checked all the plugs and they all look good (like I said, less than 8k mi on the cap/rotor/plugs/wires/etc). Basically the idle is garbage (very descriptive I know
) and the miss continues through the revs (in park). Right when I got off the highway & this started, higher revs would correct the crappy idle, but not anymore. Maybe because the engine was warm? No idea...
So my next guess would be fuel delivery? Unless someone chimes in & has other suggestions.
Did the '91 300E have twin fuel pumps? If so, could one of them have gone to hell? That would explain the hard highway acceleration on that last fateful trip... Or plugged fuel filter?
Any suggestions out there?