Vibration from low-mid range rpm while accelerating

CG3coupe02

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Ok first off, I have 02 coupe with the f23 v-tec 5spd tranny.

I've been under having this problem for some time now. i have changed all mounts and checked the subframe bolts and even rebuilt the head but still having this problem.

PROBLEM: (note: happens only while driving)
while on throttle anywhere from 1500rpms-4000rpms the cars shakes but when i let off the throttle it stops, then shakes again when i go back on the throttle. I've read that it could be a IACV, CV shaft, or egr problem. My CV boots look good still, no signs of major wear yet. i haven't cleaned the IACV or the egr yet, but if it is one of those, I'd rather buy new ones then clean them so that i can cross it off my list.

(2nd note: it only does this 50% of the time, it all depends where I'm driving. Usually on the freeway and some places in town)

Any help is appreciated!
 
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RedRyder

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No CEL? Do you hear any noises (clicking, knocking, etc)? I don't think it's the IACV.
 

Olddohc

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Its free so clean the IIACV. If you arent getting a check engine light for it it is still good. Take it off and clean it with brake parts cleaner. If its really bad let the screen sit in it for a bit. Its a small part but a picky one
 

CG3coupe02

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Its free so clean the IIACV. If you arent getting a check engine light for it it is still good. Take it off and clean it with brake parts cleaner. If its really bad let the screen sit in it for a bit. Its a small part but a picky one

Yeah I'll do this in the mean time since it's easy to do
 

CG3coupe02

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So I just changed the CV axles on both sides. That seem to have fixed it but now I'm getting a vibration in 1st and 2nd gear going from 18-25mph then after that it runs smooth. I know I put it back in correctly too. Could it be an unblalanced shaft that I got? Suppose to be brand new when I put them in.
 
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