1990 gt idle and super rich and no fuel mileage at all ????
 

k guys,here's the prob,90 gt 5.0 ,sits and idles like crap,all the power is there when i give er,just idles terriable,and super rich,like burn your eyes in 3 mins rich,i have been through all the post on here,and cant seem to get er,i also have an 87 that runs perfect,looked at it to make sure all was the same,only thing diffrent is the smog stuff is deleted,i've tried it all,even the new computer,when it idles it sounds like a lumpy cam,but worse,only mod i know it has is 70mm tb,and i think shortly headers,even went into the timing chain to check er out,and all was well,swapped out injectors no change,also did iac,tps(voltage is .98)plugs,wires,thermostat,even pulled the whole plenum off of buddies motor to see if that did anything ,I got nothin guys,i am lost,love the car,but why do they have to fight so hard hahahaha any help would be greatly appreciated.

thanx

Mike

did you pull codes? yet and if so did any come up?

yes pulled codes,
koeo-11 = all good
koer-94,44,33
cylinder balance test - 9/90= so all is good there

everything i looked at for these codes makes no diffrence,like i said ,i tried a whole diffrent plenum,with the egr,tps,iac,and nothin,no vac leaks,new 02's,full tune up,water pump,and timing chain is near new no deflection,i am lost,i've been fixin cars for the last 10 years and usually can find an answer or figure it out,it has a few buddies stumped as well,thought maybe a tune,but it aint got nuttin for mods,and no tune shops around here,she goes like a son of a bitch when i give er gas but just idles like **** and bad rich,with no economy at all,like a tank a week,you can almost see the fuel guage go down,compression test was 140 - 150, 50 on fuel pressure.

anything? lol