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when i rev my car the RPM goes down diffrent now..i takes too long to go down..what do you think cause this and whats wrong? thanks!

 
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did u do ne thing to yer car lately?

 
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detoX, that happens to me too.... wut mods do you have on your car?.. maybe we can figure out wut is causing it?

 
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ne thing?

i have a v-afc i/h/e, thats just about it? how about you prawdigy? first i thought it was that v-afc i set all the settings to 0..then i tested it its still the same..damn.

 
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which header, exhaust and intake do u have?... wut are the brands?

 
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AEM cold air intake, custom 4-2-1 header, tanabe muffler. do you think it has somethin to do with my i/h/e? but for a while it was workin great, it just happend sometime this week..

 
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you could try resetting the computer, but i suspect that your v-afc is causing the problem.

 
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iv tried it..i took out one of the terminals of the battery of for a few minutes..still the same..damn..

 
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it isn't the v-afc, b/c i have the same problem and i don thave that.... i do have the Tanabe Racing Medallion cat-back exhaust... if that's wut you have... that might be wut's causing the problem.

 
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but for a while it was workin great..just a few day ago it did..and i have the muffler for 4 months. well anyway..ussually how do you fix this problem?

thanks guys..

 
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I actually had the same problem, still do actually. It is the O2 sensor on my car. Sometimes when I hall a$$ then slow down and sit at a light, my car will run ruff and the RPM takes a while to go down then almost grounds out then the car picks up the RPM's. Weird but have had to replace the O2 twice now.

 
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Resetting the ECU should take care of the problem. The car prolly isnt used to all the new air.