this has been a problem that comes and goes. at high rpm's the car lags and sounds like it is missing. i went to the track this passed friday and that is when i noticed it was back. origionally i thought it was the coil packs so as you can see in my sig. they are gone. even though they weren't the probmlem this time they aren't going back on because the keep messing up. any way i was having to shift at 5900 because any higher and the car started to die out. it almost feels like the rev limiter is trying to kick on. dyno'ed it about 3 weaks ago for the same problem thinking that it was leaning out at the top end. on the first dyno pull the a/f was below 10. so we ran it 3 more times and it was perfect on all three. didn't hear the sputtering at all on the dyno. took it out after that and it didn't do it on the road either. now i go to the track and it starts doing it again. any idea's. this is really starting to piss me off. i have to drive about 2.5 hours to get to the track so it sucks to get there and only do 4 pass's and have to stop because i didn't want to break it. any info would be great. thanks.