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.

UPDATE - Plug wires are Volvo. I've noticed a few things - This does not happen all the time, there are times when the car runs great and when this issue begins it's like flipping a switch. WTF. I've also noticed that when it begins running rough and dropping cylinders there is quite a bit of static and crackling on the radio. This is no coincidence, one does not happen without the other. The problem also seems to be worse at low RPM and at idle, giving the car some gas will keep it going. But sometimes it will idle smmoooooth as silk, go figure.