1992 Chevy Camaro

It could be a weak coil or anything actually. Check your fuel pressure though as you may be low on pressure an dyour injectors aren't working properly. If you go to the tune up site on here it goes through a step by step on how to check your ignition system, rather than explain on here. It covers all systems so get to yours first you should be able recognize yours.

It has to be sometign in the cap or the rotor itself. It could be shorting out on the distributor shaft. Or your coil wire may be bad as well. EVen though you show a lot of spark at the cap through the wire it may be in a spot where it hits. Try sanding the contacts inside the distributor cap as they may have some lacquer or something on them not letting the spark go through it. Check the rotor and dist cap for cracks as well as that may be another thing that is causing this.