rough hesitation when cold

[turner88]

After installing the upper intake gasket on my 2zz and putting on remanned injectors, I have quite a substantial hesitation when first launching. The engine nearly cuts out and I have to feather the throttle to get it going. Once it warms up it pretty much goes away and I did get a lot of my top end back and all else seems fine. I used a torque wrench on the flange and tightened center to the outside. I do have a new throttle body gasket otw because I didn't like the looks of the old one. I did clean the gunk off and inspect for cracks, but its still questionable. I'm considering purchasing new coil packs maybe the high performance accell ones... any thoughts?

[vibrologist]

Maybe you forgot to connect a vacuum hose somewhere. Look for vacuum leaks first. That is very likely the cause of this kind of rough idling/running.

[turner88]

Thank you, I did check and reconnect those, but I haven't ruled out a cracked hose. What is the one leading from the air intake to the intake manifold with the little filter. I did use that one to do a seafom flush several thousand miles ago.

[vibrologist]

Honestly, I don't know what it is. I did not have any such trouble with my Vibe but plenty of that with my boys' Mazda Protege.
I suggest you use common methods of detecting vacuum leaks (You-tube to the rescue) such as listening with a piece of garden hose, carb cleaner or cigar smoke.
Best of luck!