Start problems 850er 2.5/20V

Hello guys, I’ve been having problems starting my 20V for some time now. The usual suspects are renewed (candles, cables, distributor cap, fingers…) the petrol pump relay is soldered. If the engine is cold, it only starts after longer start and with a lot of gas, then it doesn’t start at increased speed and needs a little to run clean. Errors are not stored. Where do I start looking?