Originally posted by PurpleMystique: ..but why would it be exactly at 2500 and 4000?
Probably not always exactly at those RPMs but I would check the air filter and clean the MAF sensor.
http://www.contour.org/mods/mods.php?s=howto&displayid=36
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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