Try pulling out the plugs and dumping some Marvel Mystery oil down the spark plug holes. I did it on my E30 and the shit worked miracles. If you can let it sit for a day or two that would be better but I would dump 2-3 Table spoons down each spark plug hole, let it sit, turn the motor over to expel any extra oil out of the holes and then put the spark plugs back in and see if it helps. You can get the MMO at walmart in their automotive section. Red bottle with a black and white lable.