Merc 380 coupe
 

Hi there,

Can anyone advise on what's going wrong with my 1986 380 SEC

At times, the engine wants to rev higher than normal tickover speed and when in drive, it is trying to pull forward. If I move it into neutral, the engine revs to 1500 then drops to about 700.

At other times, it sits quite peacefully at 500 rpm

My 'specialist' claim to have changed just about everything on the fuel injection side to repair this problem but it won't go away.