This week while sitting at a light my car began to stumble and idle very roughly, the car had been running like a top until that moment at the light. My first thought was a problem with the ignition module/coil pack. I switched those out with another set I had, and the car calmed down and idles/revs beautifully now. When I went for a test drive, I still noticed an acceleration stutter from stop. When on the hwy in cruise mode it runs fine, it'* just a slight noticable stutter on acceleation from a stop. Late last summer I replaced the fuel pump (first time in 220k); filter, and pressure regulator, balancer, timing chain, interrupter magnet and gears.
What else should I be looking for.....being OBD I my AutoXray 6000 scanner only shows minimal information. Additionally, My checkengine light is NOT on.