Scott, Now that that has been replaced. I would be sure the 02 adjustment is now correct. In other words, get the car hot and readjust. Be sure the spark advance/timing is ok. If this doesn't do it, then you many need to look at the injectors. Clean or new makes a big difference. << My car has no power beyond 4000 rpm. It was having hard start problems. A new warm-up regulator solved that problem. Now it won't run past 4000 rpm while driving. Last spring, I did a major tune-up and it ran fine. My fuel pump/suction line/strainer are fine. I have a new accumulator and fuel filter installed. Also the injectors were replaced last spring. What should I do next? I can't remember if this is a characteristic of a failing coil. The car has about 27K on it. What do you think? >>