For the advice. While looking at a parts catalog for the 104 I noticed a couple of things added to the 104, that the 103 didn't have. The 'mass air sensor' just before the air filter and a 'slide actuator' at the bottom of the air intake area. Do either of these have a history of failure.
Also, how does the durability of the 104 compare to the 103? (104.992) Did this engine debut in '94? If so, I guess it'd be a little premature to answer this question ... unless there is an owner out there with 200k + on the engine.
Thanks again for your help... :p
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi