one thing i do while i'm in there...(and i do a cleaning every two months)..is while i have the lim off i'll take a stiff brush to the head ports,esp the secondaries,and scrape off the carbon buildup,now using a shop vac(theres a attachment that fits perfectly in the head)i suck all of the carbon out,once this is done i take some seafoam or valvoline tb cleaner and spray done the heads again,again using the shop vac if i used alot of cleaner. makeing sure it evaporates or dries before i start it,or you'll throw misfire codes........imho cleaning the uim/lim/tb is only half the job,if the heads are clogged up the improved breathing of the intake isnt being fully realised...
