Ka always goes out 🙁

Hello guys, I bought a Ka 1.3 2005 for my girlfriend, 60 HP 100,000, little rust !! The car comes from Austria, but bought it here in Cologne from a dealer, about 3 months ago !!! The car always ran in the standing very restless, had some time, and I looked at the cables once, wow, marderbiss !! So off to the Ford dealer (he wanted to seriously, 130 € for the 4 cables), but a buddy has a Ford ID, there were the something cheaper (but I still find The car ran very quietly, thank God I thought, until morning at 6 o’clock my girlfriend called, and said, I am standing in the middle of the highway, what did you do??? The ADAC meant only the ignition, they did not even bother, and read out the error memory, the girlfriend waited almost 3 hours, and that in the middle of the week (for too long I mean, a woman alone on the highway) The car was towed home, I all looked, all cables on it, no mistakes found, all cables once agreed, turned on, swoop jumped the Ka at ???? I thought what should that, well anyway, something was driving, car was getting more and more restless, and went out, as if he got no gas, in my opinion, ignition key turned around, car starts, ran so about 5 km, ran restless, went out completely So off to the workshop, which has read out the diagnostic device for the fault memory, both Lamdasonden broken !! The Ka was only 3 months ago at the Tüv, the exhaust gas values were ok ??? He had deleted the fault memory, the Ka ran again 2 days without problems, just, ruckel, out, keys around, the car jumped on and ran again a few KM …. Well my question, the Ka does not run without the probes, and why does it go after a few kilometers completely ???? New lamda probes are ordered (the piece at the dealer 213 €) without the installation, which costs once again so 60 with error memory delete so around the 100 € But Why does it just go out ??, and that only after a few Kiöometers ?? Are now afraid that I spend a lot of money, and after changing the same crap is still there, what else could that be ???? As said, the Lsamda probes come in two days, let’s see, I say hello Günter from Cologne Ps. I drive a Toyota Mr2 convertible with turbo laser, and that’s 3 years without a problem (nothing against Ford, but processing at the Ka is a joke, isn’t it???