Hi guys,

I have a '90 300se with the m103 engine with which I was getting around 18mpg for a while, but have found that it has recently dropped to around 10-11mpg. I've swapped the following items so far with the same results, and am hoping that someone sees something that I might have missed:

Cap/Rotor
Ignition wires
Spark plugs (h9dc0)
Coolant temp sensor
Air intake sensor
O2 sensor
ICV
OVP

Duty cycle is set at 50%, fluctuating. I'm still reading up on testing and adjusting the EHA, so I haven't messed with that yet.

Recently, the engine has begun to "stumble" for a few seconds after starting, but starts fine otherwise. I'm guessing that some or all of the injectors may be leaking, though I don't know if they could cause such a huge drop in fuel economy.

The spark plugs looked okay but some were wet with "something," which I think is fuel. I'm going to pull the plugs again and try see if it is combustible. Also, the exhaust smells worse than before (cat is dead) but I don't feel that it smells like gas.

Anything else I should look into? Thanks for any input you may have!