Engine problems 1987 420sel 4.2l
 

First off I am new to this forum and new to the Mercedes world. I would like to start off by telling you my issues with this car. From day one. Bought it for 1100$ drove it home from Georgia. To Tennessee. Car had a terrible shake. A high idle. Shifted rough. I've replaced fuel distributor. Installed new passenger side cam . New plugs new wires . New distributor cap. And rotor.... New air intake boot. New clamp around that as well. 8 new injectors . O rings. Fixed vacuum lines on throttle body but some I'm not sure where they go . Some are right some arent . If I had to guess . Ok so all that changed . Starts right.up. idles up starts at 1000 rpms . Then works it's way up to about 1500. Rpms. On cold like 30 degree weather if you start it . It runs like ****. About 700rpms. And finally starts reving up . The car has drove me insane . But I love the ride. I've got a crazy idea to put a carburator on this engine . But idk yet. Any help is much appreciated.