Desperate Cry for Help (intermittent spark)

[CobraJoe]

I've got a 95 TBI with a Jacobs ignition on it. It has started dying whenever the hell it feels like it. Always starts well when it's cold, and seems to get pissy about the time I get to work (15 minutes @ 55). I've Plugs, wires, cap, rotor, and DI module are new, as well as fuel pump, inlet filter, and fuel filter. It will spark again after sitting for somewhere between two minutes and two hours. I'm about to replace the reluctor and magnet for the pickup coil. Since this to will probably not fix it, could somebody offer other suggestions (short of a stick of dynamite)? Thanks in advance.

[J-Ri]

The coil might be heating up and shorting, then it works again once it cools down.

[bigdaddy1832]

Go ahead and replace the pickup coil on the distributer. That sounds real close to what mine was doing and the pickup coil was bad.

[CobraJoe]

I replaced the entire distributor, but it still didn't fix anything. The pickup coil failed the tests, so I got some false hope up. sigh.

[bigdaddy1832]

Man I thought for sure that was it. HAve you checked the oil pressure sending unit? If the computer thinks it has lost oil pressure then it will shut off the spark but I don't know for how long. ESC module and coil are the only other things I can think of right now.

[CobraJoe]

yeah, I'm down to the PCM, the coil, the Jacobs ignition module itself, and maybe the fuel pump relay.

[kenny-1907]

Sounds kinda like what my 88 was doing to me and it was the ignition module. It would just up and die when it was sitting ideling at a stop light , but it would usually fire right up again.

[CobraJoe]

I replaced the ignition module, twice. Once when it tested bad at Autozone (but fixed nothing), and the new distributor had one too. No joy!