My friend has an 89 Volvo 240 GL. It runs good then sometimes it will shut off while driving, it also happens when the car is at a red light or stopped in traffic. The idle will go from 400 to 1200 rpm on the tach. I checked the codes and came up with 2-3-2 (fuel system compensating for rich or lean air/fuel mixture at idle, and 2-1-4 (speed sender signal missing or sender faulty).

Prior to this problem it had an exhaust leak at the flange and exhaust manifold. He drove it for a couple of months or so. The plugs, and cap/rotor were replaced, and checked all the plug wires. Number 3 plug wire needed replacment. Also replaced the fuel pump relay. I check the AMM/MAF sensor, while the engine was running, it ran bad, but plugging it back in, the engine began to run fine (other than the high RPM at idle).

I checked the Bentley manual, but it does not really explain what to check for. Would the speed sender cause this problem, because of a leaky fuel injector, 02 sensor? Any help would be appreciated.

I'd bet its a real straightforward CPS issue. Cheap and easy to replace (89 244 has good left hand access to the bellhousing) with a long extension and a 10 mm socket. Piece of cake, unless corroded in place.

I was right with you until I read that he has a High Idle issue along with this.
I'd check for that yellow stripe and swap out as preventive maintenance anyway.. The High Idle has me wondering
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