I just thought I might point out that the symptoms described are about as general as one could make them.
Absolutely every possible defect to combustion are possible. I see only one hint from your general description. That is that the car runs worse warm. Thats it, what can be made from such info.
Not much, the car runs richer when cold so my guess is that you are too lean.
You have given us little more than to say your car is broken and ask what is wrong. I don't wish to be negative, but it is insulting to think that people think automotive technology is so easy. No wonder people think auto repair cost too much. Listen to simple description of problem, move car to shop, wave ones hand, and come out with a big bill. I'd be pi**ed too.
Bosch Master, ASE Master, L1
33 years MB technician