New Engine!

When we had the car out a few weeks ago we knew there was something not right with the engine and not just the ecu map. The problems we had were different every time we started it sometimes it would idle really fast other times it wouldn't idle at all. It sounded like it was running on 3 cylinders when it was revved up and also got really hot quickly. We wondered if one of the injectors was not working properly so we took the inlet off to check and they were fine so shoved the inlet back on tried it again and it ran better like all 4 cylinders were working. This made us check the inlet more closely and realised 1 of the seals for the injectors was missing and another one was damaged. This meant air was entering where it shouldn't which made it run badly. Dad got hold of some new seals for the injectors and re worked the inlet too to make sure it was all air tight. We took all the coolant pipes off to re seal them as well because they were a bit leaky and wanted to make sure that was all working well to keep the temp down. But having tinkered with the current engine loads and scratching our heads why it still isn't running properly we have decided its knackered. So out it comes and we got hold of a new one to put in. Didn't think we would be changing the engine already lol. After reading a bit more into the problem it turns out the Zetec engines are quite sensitive to what oil is used. Because they run quite hot they need the right oil 5w30, we had been using some stuff dad had lying around lol 10w40 at a guess. Bought the new engine from a local scrap yard for £90 2.0l zetec 99 focus. We set about stripping it and tidying it up.