I give up (miata question inside)

Just recently bought a 90 miata 1.6 short nose. Drove fine with the exception of some pretty bad lifter tap at start up (I understand that is normal?) Anyway it decided to start idling high around 2200rpm. I removed the TB and cleaned the idle control. After putting it back together it started up just fine and ran great like it did before. i reset the idle per the Haynes manual. I shut the car off and went about the rest of my day at the shop. After about 3 hours I went out to the car to go home it wont start. I find there is no spark. Things Ive checked:

Plug wires have correct resistance

Coil pack is good per the resistance test in the Haynes manual.

Timing belt is not broken I can see the cam moving under the oil cap.

I have 12v at the cam sensor.

The unique problem I found today was every time I crank the car I blow the 30a IGN fuse in the under hood fuse block. Any idea what causes this. Changing the fuse does not get the car to start.

Thanks for your help.

Pinched wire near the throttle body? Something in that fuses circuit is grounded, when it shouldn't be. Coincidences are possible, but I'd head to wherever you were today and recheck whatever you touched.

This sounds obvious, but have you tried pulling any CEL codes? It's really easy on those early Miatas, if you jump two ports at the diagnostic connector by the front left shock, when you turn on the key the CEL will flash a code that you can look up in the Haynes manual. I can't remember which two ports exactly, though, it's been a while since I've done it.

Forgot to mention this but the CEL doesnt work. It doesnt come on at start up it did before this problem. With GND and 10 connected it still doesnt come on or flash at at all.

My 91 Miata started idling at 1500 today for no reason too. It did it after i had driven it for about an hour and then went to park it, when it was stopped the idle was at 1500 instead of the normal 800-900 range. It dropped to 900 after about ten seconds but I'd like to figure out why it did that.

The fuse has to be the key. They don't pop for fun, especially 30A ones.

You say it's the IGN, but I think you mean INJ? If I'm reading the diagram correctly, that's the one that would blow if you shorted the wire to the idle speed controller.

Are you getting fuel? You say no spark. Is there 12V at the coils (blue wire)?