Ok now i have a edelbrock 750 on my car and its got the factory jets in it and one stage leaner on the metering rods with yellow springs. now the car is runnin a little rich i think cause of such bad gas milage and its a little stinky. now if to lean out the carb i turn the ims in then why does the car run liek **** with them in to far? its like u get to a point where its tuned the best and its still rich so u have to go down in jets and tune it to the best and see if its still rich. now doed this make sence? i hooked up a vacum guage and no matter wuti do i can't get above 13 and it goes to 13 then to 10 or 9 then back up. any input woudl help me greatly. thanks