It is the VANOS working in conjunction with the cold start injector... once your engine reaches that proper temp, the "shaking" goes away.
If the check engine light is blinking that means an engine cylinder misfire has been detected
If you are saying the engine starts and runs for 15 seconds and dies and then starts again for another 15 seconds and dies . . . the distributor seems to be doing its job. You might want to check if there is a fuel restriction somewhere (filter or pump).
Fuel pump
wheels off van raised engine shakes side to side at 40 kmh
if the engine is knocking really loud you probably need to overhaul the entire engine or get a new or used engine because loud knocking is not good
if it starts and runs for just a few seconds then dies it is generally a carburetor issue. clean or replace the carb and that should solve your issue.
If white smoke is coming out of the exhaust when the engine is warmed up , it sounds like engine coolant is getting into an engine cylinder
It's probably your IAC.
The contour warm air blower starts on a timer 45 seconds after the burner initially starts, not on temparture
Diagnosis: Engine Won't Start or RunCheck related link below
change fuel filter
1991 mitsubishi eclipse 2.0L starts 2 to 3 seconds later shuts off