Our '94 940 (B230F, NA, Regina) quite suddenly developed a case of very sluggish take-off. Once rolling, the car is as strong as ever (ie adequate) and has no trouble hitting 140 kmh., and could probably do 150 or more. It starts well, but the idle is low and rough.

I had put a can of Jectron in the tank, and this ocurred after the first high-speed run with this in. I have also recently repaired the intake heater "stove" at the manifold. I do get "check engine" sometimes. I plan to check the codes, but I am not all that confident that will be useful, it usually isn't.

Any "usual suspects" for this one? Thanks.