ever had anything done to the fuel system, such as, fuel pump replacement, relay, or the fuel filter? also, you may want to check the connections @ the ECU, as if the connector is loose, and full of crud, as mine was, it'll certainly make it run bad,and, possibly be the cause of the erratic behavior you've described.....also, poor grounds to the block, etc., will certainly create those kinds of problems, but you probably already know that. do you hear the fuel pumps runnin as normal, right before it quits, and on re-start?? if not, i'd go and check all the basics again, first,before i'd go and spend money @ the mechanic's... wish i could tell u more, but i'm still learnin about these cars, and these guys certainly helped me get ours back on the road one week after we bought it for my daughter, there are some very friendly , and knowledgeable folks on this board, so good luck, and let me know what you find, louis