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Bringing this old thread up again. I just found out about this EVO system, or the manual calls it variable assist steering. Apparently it's junk, since GM is now offering a kit to bypass it. I am not sure what all the system has in it, but where the rubber meets the road is the EVO valve...

If it is dumping fuel into the engine, it will foul the plugs and they will not fire if they are wet. You already know that, but until you get it figured out, you are going to have to continually take the plugs out and try to dry them off after each trial start if they are wet. You may have...

Take it to autozone or someplace else and get them to read the codes from the computer.

You have a code R Vortec 350 correct? If so, here's what I have learned about this dist setup; You cannot change or vary the timing of this engine. The timing is determined by the crankshaft sensor which is not adjustable. But, you do need to get the rotor pointed to the correct post in...