I just bought another 240. 87 240 w/ B230 motor. The motor chugs or bogs for a split second then runs ok. It's definately missing on one cylindar from idle, I turned up the idle, it helped. I put a clean set of bosch plugs, new air filter and cleaned out the flame trap and it made no difference. Revs good, but from idle for a split sccond there is a slight miss. I suppose I could go further and replace the cap & rotor and plug wires, but it does not seem like an ignition problem. Is it possible one of the injectors is clogged? Will injectors from an 86 740 B230 work? I've got a complete fuel rail and injector setup from that car. They look like the same ones.
Ben