Run the mixture screws in till they LIGHTLY bottom out, then turn them out 2 full turns. With the engine running, turn each screw in a little(1/8-1/4 turn) untill the idle starts to "drop" off, then turn the screw back the other way till it picks up again, and to fatten it up a little just turn the screw out 1/4-1/2 a turn. This should get you in the ballpark of a good idle setting with no eye burning. If this doesn't help then I'm afraid you're gonna have to pull the radiator cap off. Pull the cap, back your ride out from under it, then pull a Dodge truck under the radiator cap, re-install cap, and drive off happy!