weird 944 cold running problem
 

We have an early 84 944 in our shop that starts great and within 1-3 minutes of driving, begins to feel like you are driving thru mud. Lots of resistance with sluggish throttle response from idle thru 3200 rpm. After 3200 rpm, it runs okay- not perfect, but okay. Now 5 minutes into warm up, the symptoms disappear and the car runs perfect! Parts replaced so far: throttle switch, temp sensor for the injection, air flapper box. Fuel pressure okay, secondary okay, oxy sensor new, reference sensor new, coil new.
Any ideas?
Thanks
Dave

Aux. Air Valve?

aux air valve sounds like it.

obin

We will check and post the results- thank you