My 94 Z71 chevy will turn slowly but not fast enough to start motor. This begun after me & a friend changed the flex plate & starter. I have put in shimms on the starter & it didn't help. I have taken out all 8 sparkpugs & still the same. I have check & changed some of the wires from the battery to the motor. Does anyone have any idea what is wrong?? Oh I have set the Tim I g & adjusted on the valves some. Ideas please I'm at a lost and it is my only vehicle....

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    Did you use the correct flex plate? Did you install it facing the correct way? Have you rotated the rngine by hand to hear if anything is binding? – Solar Mike Jan 12 at 7:38

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