92 s-10 2.8 valve question

I recently replaced the intake gasket as well as the distributor o- ring. I got the top end back together and adjusted the valves as specified by the manual that i have. my problem is that the truck
idles incredibly high after setting the timing to 10 degrees before TDC and the truck has absolutley no power. I drove it a mile and it barely got me home. I am hoping that i didnt overtighten the valves, but i think it is looking like i did just that. I dont believe i have a vaccum leak creating high idle, but that would cause my lack of power anyway. would it? i also read from some fellow s10 owners that you need to unhook a bypass wire from the ECM when you set timing. Is this true? can you steer me in the right direction?
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I'm not positive, but I'd think these are hydraulic & you should adjust valves w/engine at oper. temp. & idling. Back off each one until it starts clacking, then slowly tighten until that one's clacking barely stops the noise. This is zero lash. Tighten it an additional (whatever manual specifies--often 1/4 turn) amount, and go on to next one. Good idea to repeat procedure once again to obtain the "fine" tune. s
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