1999 FOOL!! thats 96-98

for the 99s, the code should be EGR Insufficient flow..

FIrst remove all the plastic covers, then there will be a collection of 12mm nuts/bolts right in the middle of the enigne holding the upper and lower intake. remove those and as you lift up the upper intake remove any plugs or vaccum hoses keeping it from coming up, once you can see inside of the runners, if you look towards the throttle body side of things youll notice a little hole with carbon down in it and you can use a screw driver to push down in the hole to clear up the carbon blockage, then use a wire pipe cleaner to clean out both the whole in the lower part of the intake and in the upper..