Hey guys, i have my 89 daytona shelby, well, i am having idle issues, when it warms up i will let it idle and it will keep bogging down to about 500 then bounch back up to 1000, then settle to 900...i thought it was the ais motor, so i replaced it with one from a 52mm tb...i then proceded to reset the position of it...also, when the fan comes on the rpm will go up...and i think that means the ais is doing its job????.well, still doing the same thing...theres one other thing, i think it might be and that is an exhaust leak at the d/p donut..i only could get one of the spring bolts on...so it has a exhaust leak right there...you think that would cause it stumbling? The vacuum lines are all redone...theres no codes...i also took the tb off and cleaned it...any suggestions would help...thanks!