Volvo: rough idle when stopping/check engine light on and flashes, electrical portion, rought

Question
Ray,
 1998 s70 turbo changed plugs,wires,rotor,cap,fuel filter. cleaned maf. runs with full power but now when i slow to a stop it has a rough idle but does not stall out. check engine light is on and flashes periodically. on another note- abs and tracs off lights come on periodically as well.

Answer
Ron,
See what the codes are and follow them to see if they lead to the cause of the rought idle. If there are not any codes, check to make sure the engine is supported on the mounts or have the mounts sagged and not the engine is touching the subframe by the trans and the vibration is what you are feeling. Read the codes for the ABS. Many control unit have gone bad in those cars. No codes could mean the electrical portion of the ignition switch is bad and no power is flowing to the ABS control unit.