My car is stumbling at idle a lot , barely runs, i think the valve clearances are way off, i did an engine overhaul and the valve shims got mixed around over time on my bench, and i never checked the clearances, stupid me, but i also checked my cps because i had a code for it, and the wires have breaks in the insulation, could it be just from the valve adjustment, or is it the cps??? Also, i think it is the valve clearances becuase when its hot it tends to run crappier, any insight for me ?????????