Folks, I've got a 1990 760T that's just started running like crap. It runs well cold (New England kind of cold) and at idle hot or cold, but when it warms up it starts sputtering and choking and gasping and dropping cylinders under any kind of load. You stomp on it and it just chokes and shudders and tries to stall, back off on the gas and drive like a little old lady and it holds together pretty well. Fuel filter and air filter are new, vacuum lines are new, plugs and wires are relatively recent. Any ideas would be much appreciated.