Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Cheap Intake off, now misses at high RPM HELP

Alright, you where all right, the Cosmo air filter set up is crap.
After a day or so, it started missing at high RPM, so, I took off the whole thing and put back on the factory intake.
Now it still misses at around 4-5k RPM.
Then occasionally, the car will pull weakly to around 4K RPM and will leap ap to 5K then go flat.
Only in 1st and 2nd gears.
All other gears are fine.

Do I need to re-set something?


Any help would be much appreciated, really.