Originally Posted by Paladin
^^ that would be the air con putting a drag on the engine. all zetec foci do it..
i wonder if the tumble flaps in teh intake manifold need to be cleaned up. if they get sticky it'll really rob performance.
I know the A/C will make it feel a little draggy and I'm prepared for this. But this is a VERY noticable and even audible stumble between those RPM. It does it only every so slightly with the A/C off so I know it's worsening the symptom.
Are the flaps active at that RPM range? This stumble is present even if I accelerate slowly with less throttle input. Related to this problem, if the A/C is on and I need to accelerate from a traffic light it acts as if the engine will die before actually taking off, unless I rev to about 2000 and feather the clutch. This problem is non-existent with the A/C off. Do I just remove the intake manifold to take a look at the IMRC mechanism? Thanks!