crossfire restart problems
I have an '83 Z28 with a 305 and crossfire fuel injection. On a cold start, it starts perfectly, and if i get the engine hot, shut it off, and then restart it immediatly, it restarts perfectly. If the engine runs long enough to reach max operating temp(200-220 degrees F), and then is shut off long enough to cool to anywhere between 120 and 175 degrees, it does not want to restart. It starts for 2-3 seconds before starting to lope(almost like an engine with an oversized cam), sputtering and dieing out. The only way to get it torestart in this situation is to keep pumping the throttle wide open until the engine evens out and clears up. Propping the hood open after shutting the engine off solves the problem, and mixing race fuel with my 93 octane helps, but doesn't fix the problem. I obviosly have a fuel/heat problem, but the mechanics i've talked to are stumped as to the exact problem. I've replaced spark plugs, the fuel filter, checked the fuel pump(good), fuel pressure(11lbs), replaced the engine temp sensor, and checked to make sure my injectors weren't leaking gas into the intakes when the engine was cooling. My problem started the summer of '09, around the time ethanol was put in our gasoline. I'm wondering if it's related to the 10% ethanol in our gasoline. Can anybody help me with my problem?