[Kemo]

I had similar symptoms on my previous SC. I had a 78 with an 83 motor in it, no lambda runnig in loopback. the car would start great cold. however, after driving for a while and then letting it sit for like10 min, it would turn over and never start and eventually flood out. After sitting overnight, it would start just fine. after extensive tinkering, I replaced the cold start switch on the front and the cold start injector, which was apparently stuck open. So you may be having some similar issues. if it were me, I would spend the money on a CIS pressure test kit and at least get some baseline control and system pressures at cold,warm-up, and hot. It could be that your control pressures are too high (lean) or too low (rich). Both of which can cause wierd issues.

Here is something you can do in the mean time. With the injection lines connected to the injectors, pull the injectors from the bung and place in a clear mason jar. You will need a jar for each side. remove the air filter cover and the air filter. turn the key to get the ignition and fuel pump going but dont try to start the car. Check to see if the injectors are leaking. if everything looks ok, carefully raise the air metering plate which is in the area below the air filter. by lifting it, you should get the gas flowing thru the injectors. Check each one for a decent spray pattern.

for my car, i occasionally run the gas tank down to almost empty and pour in a couple of bottles of techron or berrymans. I lift the meter plate to full throttle and run the tank down. I keep recycling the gas/techron mix a few times just to kinda clean the injectors and the system.

I also use this lifting of the plate to prime the injectors after engine drop and what not.

in any event, its pretty easy to check the pressures with the kit. This will tell alot. I dont have an easy way to test the cold start injector. its pretty hard to get to, but it shouldnt spray all the time, only when its real cold.

just recently, i was working on a 2.7 CIS and found the control pressure plunger to be somewhat stuck in the upward area of the fuel distributor, so all the injectors were flowing without lifting the plate at all... ya never know until you get in there and poke around. You almost have to become a CIS expert with these cars. But hey, once you get it sorted out, you should be good to go for many many years.