start with changing the coolant temp sensor the white one on the drivers side of the cylinder head. Then check for all vacuum/air leaks especially under the intake boot near the throttle body, there are supposed to be hoses there, often overlooked. Also look for obscured holes in lines all over the engine bay, near firewall and etc.

Pull the cold start valve from the intake if it still won't start and put it in a plastic baggie. See if it squirts fuel, if it doesn't be suspicious other injectors are not getting fuel. If they are, then check for spark, make sure you are getting a repetative spark, and that the ignition timing is correct, check wires to the distributor, and other sensors they often break get brittle short out.

Sounds like the ecu relay that is only on the 93 94 models..

That could be it...or could be a faulty wire somewhere, fault ecu...lots of different things..weird happen to these cars. I own two of them and I am working a vr6 clutch/timing chain job right now...lots of work! ****...

mine would not start with the temp. sensor unplugged. This is just something that worked for me, Disconnect the neg batt terminal, Check all the connections under the hood involving fuel, air, and water temp. With the Battery neg disconnected, ground any static charge like you would a computer, Turn the ignition to start like normal, and ground any other sources like the windows, radio, anything that would hold a memory. then Reconnect everything. then start as normal.

might just be a coincidence perhaps the ignition switch is going bad. Check for spark fuel... and you will have a better idea of what is happening.

Yes & no.

As with any repair/diagnosis, the more tools you have available
to use, the greater the chance of you finding & solving the
problem.

Intermittent problems can be a pain, since in most cases, when
the problem occurs... you do not have the tools with you or
not attached.

There are simple things to keep an eye on/check when the
no start occurs.

2 important ones being:

- the check engine light is not illuminated when the key is
in the ON position (No power to ECM, ECM relay?)
- when you turn the key to crank, does the battery light
go out right away (before engine is actually running)? This
would be a sign of a faulty ignition switch (power is
lost in the crank position).

Ignition switch!