Hi guys , i just had this w123 200 1984 from my dad , it was parked for about three years now and i started rebuilding it in july , nothing major just the tyres and got the engine started till i take it to the workshop as soon as my money comes , at first it used to start great , my mechanic advised that i start it up twice a day for half a hour , so i did , till last week , the engine revs only at 2000 rpm ,, it used to work just fine , but now i hit the peddale to the meddal and nothing but a 1500 to 2000 rpm only , then it had a second problem , now it starts for 1 or 2 minutes then suddenly dies on me , i have to wait at least 10 minutes before re starting , i hope you guys could help me solve this issue ,, as soon as possible oh and before the first re start ve changed the sparks , engine oil , and every thing that needed to be done