If you are off by one tooth on the distributor, you can usually get it close to running correctly by spinning the distributor fully one direction or the other...essentially making you only 1/2 a tooth off. And yes, 1 off either direction will cause it to run like schidt or like a raped ape...dont ask which direction does what- my brain is pickled. But if you were able to set the timing to 5* BTDC and the distributor lockdown bolt was riding mid slot...then your distributor isnt off a tooth. Chain might be though. If you can crank the idle screw in fully closed and the engine still runs then you have air getting in somewheres. Look around again for any source of vaccum leak. Length of hose makes a good stethascope for searching for leaks around the intake. Is your Auxiallary air thingy all hooked up proper?? Ya know the valve thats directly under the throttle body. Double check to make sure the EGR coupler nut is tight. When my 4Runner ran with the idle screw shut I found that I hadnt tightened the coupler....oops. Once sealed problem was solved.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />