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Discussion Starter #1 (Edited)
I recently had my engine rebuilt on a 1999 Prelude and after the tune (P28 Hondata S100) and everything my idle jumps up and down from around 400-1200. It also won't rev beyond 4k. My spec are:

ported head with blox cams
blox springs and retainers
aem cam gears
block sleeved with arias 87.5mm pistons
scatt stock size rods
kaizenspeed balance shaft eliminator kit
step decked @ .003"
skunk2 im
skunk2 66mm tb
aem intake
dc headers
apex'i n1 exhaust with stock cat

I was told that I need a bigger header and to remove the cat to improve airflow which is understandable, but would that be causing my problem?
 

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That exhaust shouldn't matter.....try running an open header lol. But sounds like somethings not hooked up right or there's and issue with the tune or ecu.

Sent from my DROID X2
 

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ecu is in closed loop mode, so it wont let you rev past 4k rpm

mine idle settled when we turned intake cam gear little bit to minus and after we adjusted ignition

tuning problem pretty much

I was told that I need a bigger header and to remove the cat to improve airflow which is understandable, but would that be causing my problem?
nope, better header would just give you some gains.
I have used magnaflow/catco high flow cats, they doesnt really hold you back at all there
 
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