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is it just a rough idle, or does it misfire when driving as well? & is there a pattern to when it starts to 'run rough' like only during cold starts or also when the engine is warm?
a clogged cat could be the case, but unlikely since it was fine prior to the service you just got (doubt its a bad o2 sensor as those shouldn't cause rough running issues on the elise)
the catalyst code for our cars are sort of strange, you would think it immediately means bad CAT, but based on other threads it tends to be anything but that since the rough idle is prominent
from what your explaining makes me think that its possibly a bad ground/sensor not seated correctly/air leak at the intake/maf
with that said, check to make sure the intake tube clamps between maf to the throttle body is tight/secure (including the maf & maf harness itself).
also check the ground wire from the engine harness, specifically the smaller one right below the oil fill cap that bolts to the head (coincidentally above the transmission & very well could have been unbolted/messed with during that service)
there are a few other pointers ill give based on your response to this reply (for the sake of not writing a novel yet)
a clogged cat could be the case, but unlikely since it was fine prior to the service you just got (doubt its a bad o2 sensor as those shouldn't cause rough running issues on the elise)
the catalyst code for our cars are sort of strange, you would think it immediately means bad CAT, but based on other threads it tends to be anything but that since the rough idle is prominent
from what your explaining makes me think that its possibly a bad ground/sensor not seated correctly/air leak at the intake/maf
with that said, check to make sure the intake tube clamps between maf to the throttle body is tight/secure (including the maf & maf harness itself).
also check the ground wire from the engine harness, specifically the smaller one right below the oil fill cap that bolts to the head (coincidentally above the transmission & very well could have been unbolted/messed with during that service)
there are a few other pointers ill give based on your response to this reply (for the sake of not writing a novel yet)