Hi all, I am having trouble figuring out why my 740 Trubo is running rough. It started intermitently running like it wasn't getting fuel or misfiring. When I would step on the gas hard it would start running well and take off. The problem has gradually gotten worse to a point where it is always running rough and lacks power. The check engine light comes on for a few minutes when the car is started and then goes off. I have replaced the fuel filter, spark plugs, distributor cap and rotor, and fixed the pcv line that had separated from the oil trap. I have not found any broken or disconnected vacuum lines. I'm not sure what to check or replace next. Any suggestions would be appreciated.
Thanks.

 

Go to www.stepbystepvolvo.com for "Real Life Volvo Quiz." My 740 had similar problems. The quiz may help your situation.