i have a 2lt in my surf, and its just started to miss and smoke after about a minute of idling

its been running fine up until now, my engine is pretty stock apart from egr valve being blocked of, i have also unplugged the plug and air hose which i think controls the butterfly for egr valve. my exhaust has been undone at the first flange,its boosting 14 pounds.there is no smoke what so ever from motor apart from when it starts to miss then there is heaps of smoke and when the miss starts it some times revs it self up. the miss will clear up when you give it some gas but will return once left to idle again, i think i have a pretty good motor and its the fastest surf i have driven (2.4/2.

. so any help to why its doing this will be much appreciated. do i need to bolt my exhaust back up or is it some thing to do with my glow plugs as they are not the best or some thing else

91 Surf white, 33inch mudstars 10s suspension lift body lift 2.4 turbo manual running 15 pounds manual hubs 12000 pound winch lots of spot lights and a cb