I just got a 1990 300E. It seems to be a bit low on power...sometimes going up hills I need to completely floor it and it won't really accelerate much. Really noticeable above 2500rpm. I'm not really sure where to start...I have a bunch of parts on order like filters, plugs/wires/cap/rotor for a tune up. It sounds like there might be an exhaust leak due to a sound (sort of a hissing) but really only hear it under load and somewhat at idle. Would all of this indicate a failing fuel pump? Air pump leak? What would the symptoms be of each? Most of my gas engine experiences were with well...not overengineered engines.

I'm still trying to get my head around all of the acronyms on this board, much more complicated than the old diesels!

Car has in between 100k and 120k I believe, odometer is slow/inaccurate.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth