i have a throttle body 350 and it won't crank could it be the cap and rotor??

it has no fire to plugs for a couple tries after i take them out. but a coil wouldn't be that erratic you think it would either fire or not fire. and how do i check fire from the coil?

Use a test light attached to power, and you should have pulsed ground going into coil. If no pulsed ground either an ignition module or pick up coil. Easier to check pick up by ohm checking.

Check fire from coil just like checking fire to plugs. Insert phillips screwdriver into coil wire hold shank about 1/2" away from metal ground, spark should jump gap. While someone turns eng. over. Or use spark tester if you have one.