well ive replaced the coil,leads, plugs, done a major service, when i drive the car it goes fine, turn it off no go(and no spark)and the engine is at normal op temp, im thinking it mite be the dizzy module? and i have wired up a trip computer , could this cause a problem to? any ideas ?

I would suggest distributor TFI module...they can die under load or just die all together. They also hate moisture.

well i replaced my dizzy with a brand new unit,$150 later, set up my timing marks, but one thing i didnt do was mark a spot on the block for the new dizzy to sit about tdc, anyway put it all back 2gether, went to start it, it wont start, you can here it sort of wanting to fire, but there is no go, is there anything that i have done wrong or overlooked? anyhelp would be epic!!!